睷眮楢楯歡慲攮捯m - ibiokaare...radiated uniformly in all directions and that radio waves...

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1)Electromagnetic waves consist ofA compressions and rarefactions. B. vibrating electric and magnetic fields.C. particles of light energy. D. high-frequency gravitational waves.

2) Electromagnetic wavesA. always travel at the same speed.B. need a medium to travel through.C. can travel through a vacuum.D. cannot travel through the vacuum of outer space.

3) The main difference(s) between a radio wave and a light wave is(are) itsA. speed. B. wavelength. C. frequency. both a and bE. both b and c

4) Which of these electromagnetic waves has the shortest wavelength?A. radio wavesB. infrared wavesC. X raysD. ultraviolet wavesE. light waves

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9) If a light signal and a radio signal were transmitted simultaneously from a nearby star, the first signal to reach the Earth would be

c. neither: they would both reach the earth at the same time.


5) Compared to ultraviolet waves, the wavelength of infrared waves is

A. shorter B. longer. C. faster. D. slower E. the same

6) Compared to radio waves, the velocity of visible light waves in a vacuum isA. less. B. more. C the same.

7) All of the waves listed below are a part of the electromagnetic spectrum exceptA. sound waves. B X rays. C. gamma rays.D. light waves. E. radio waves.

E. none of these.

8) Materials generally become warmer when light isA. absorbed by them. B. reflected by them.C. transmitted by them. D. all of these

A. the radio signal.B. the light signal.

10) Light waves traveling through the vacuum of space have a speed that's equal toA. 3.0 X 10 to power of (3) m/s.B. 5 X 10 to power of (6) m/s.C. 3.0 X 10 to power of (8) m/s.D. 9.0 X 10 to power of (9) m/s.E. a number that's too high to measure.

11) Color depends on what characteristic of light? A. its frequency B. its wavelength C. both of these D. neither of these

12) The color of an object is the same as the light that isA. transmitted. B. absorbed.C. reflected. D. all of these.E. none of these.

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14) The fact that you can get sunburned while submerged in water is evidence thatwater

15) The worst thing you can do for the health of a green-leafed plant is to illuminate it with only

Use the diagram below, answer question 21.


13)Sunsets are red because the lower frequencies of lightA. are scattered by larger particles in the atmosphere.B. are refracted by larger particles in the atmosphere.C. are reflected by clouds and relatively large particlesin the atmosphere.D. survive being scattered in the atmosphere.

A. absorbs infrared light. B. transmits infrared light.C. absorbs ultraviolet light. D. transmits ultraviolet light.

A. red light. B. green light.C. blue light. D. all are equally naughty.E. none of these.

16) The effect in which white light separates into different colors is calledA. magnification. B. refraction.C. reflection. D. dispersion.

17) Diffraction is more pronounced through relativelyA. small openings. B. large openingsC. same for each.

18) Waves diffract the most when their wavelength isA short. B. long. C. both diffract the same.

19) Diffraction is a result ofA. refraction. B. reflection. C. interference.D. polarization. E. dispersion.

20) Interference is a property ofA. light waves.B. sound waves.C water waves.D. all of these.E. none of these.

21) Polarization is a property ofA. transverse waves.B. longitudinal waves.C.both.D. neither.

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22) Light will not pass through a pair of polarizing lenses when their axes are

Using the figure below, answer the next question:

Hz electromagnetic wave propagates in carbon tetrachloride with a speed of8

29) A 2.12 ! 102.05 ! 10 m/s. The wavelength of the wave in carbon tetrachloride is closest to:A) 1070 nm B) 1290 nm C) 1200 nm D) 967 nm E) 1420 nm


A. parallel.B. perpendicular.C. 45 degrees to each other.D. two of these.E. all of these.

23) The incident light ray, the reflected light ray, and the normal line between themA. form two angles, with the incident angle greater than the angle of reflection.B. form two angles, with the incident angle less than the angle of reflection.C. form two angles, with the incident angle equal to the angle of reflection.

24) When light reflects from a surface, there is a change in itsA. frequency. B. wavelength.C. speed. D. all of these.E. none of these.

25) When light passes through air into glass, its angle of refraction isA. less than its angle of incidence.B. the same as its angle of incidence.C. more than its angle of incidence.D. can be more or less than its angle of incidence.

26) Light travels fastest inA. warm air. B. cool air. C. a vacuum.

27) Refraction results from differences in light'sA. frequency. B amplitude. C. speed.D. all of these. E. none of these.

28) Light refracts when traveling from air into glass because lightA. travels at the same speed in air and in glass.B. frequency is greater in air than in glass.C. frequency is greater in glass than in air.D. travels slower in glass than in air.

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14 Hz electromagnetic wave propagates in carbon tetrachloride with a speed of2.05 ! 108 m/s. The wavelength of the wave in vacuum is closest to:A) 413 nm B) 368 nm C) 505 nm D) 459 nm E) 314 nm

14 Hz electromagnetic wave propagates in carbon tetrachloride with a speed of2.05 ! 108 m/s. The relative magnetic permeability of carbon tetrachloride is 1.00. The dielectricconstant of carbon tetrachloride at a frequency of 8.38 ! 1014 Hz is closest to:A) 2.52 B) 1.38 C) 1.76 D) 2.14 E) 1

A) (-2.7 ! 10-10 T) kB) (+2.7 ! 10-10 T) kC) (+2.7 ! 10-10 T) jD) (-6.8 ! 10-9 T) jE) (+6.8 ! 10-9 T) k

A) (+3.8 ! 10-7 W/m2) i

B) (+1.9 ! 10-7 W/m2) i

C) (-1.9 ! 10-7 W/m2) k

D) (-3.8 ! 10-7 W/m2) i

E) (-1.9 ! 10-7 W/m2) i

30) A 6.53 ! 10

31) A 8.38 ! 10

32) A planar electromagnetic wave is propagating in the positive x-direction. At a certain point Pand at a given instant, the electric field of the wave is given by E = -j 82 mV/m. The magneticvector of the wave, at the point P at that instant is closest to:

33) A planar electromagnetic wave is propagating in the positive x-direction. At a certain point Pand at a given instant, the electric field of the wave is given by E = -j 12 mV/m. The Poyntingvector at the point P at that instant is closest to:

2. The maximum value of the magnetic field in the wave is closest to:A) 7.79 ! 10-8 TB) 1.56 ! 10-7 TC) 5.51 ! 10-8 TD) 1.08 ! 10-7 TE) 3.89 ! 10-8 T

34) The magnitude of the Poynting vector of a planar electromagnetic wave has an average value of724 mW/m

2. The wave is incident upon a rectangular area, 1.5 m by 2.0 m, at right angles. Thetotal energy that traverses the area in a time interval of one minute is closest to:A) 210 J B) 340 J C) 300 J D) 170 J E) 250 J

35) The magnitude of the Poynting vector of a planar electromagnetic wave has an average value of939 mW/m


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A) 2.5 B) 2.1 C) 1.7 D) 1.3 E) 2.9

A) 1.4 ! 10-11 J/m3

B) 5.1 ! 10-12 J/m3

C) 3.6 ! 10-12 J/m3

D) 7.2 ! 10-12 J/m3

E) 1.0 ! 10-11 J/m3

A) 1.7 ! 10-4 W/m2

B) 3.4 ! 10-4 W/m2

C) 1.2 ! 10-4 W/m2

D) 8.6 ! 10-5 W/m2

E) 2.4 ! 10-4 W/m2

36) An 800-kHz radio signal is detected at a point 4.5 km distant from a transmitter tower. Theelectric field amplitude of the signal at that point is 630 mV/m. Assume that the signal power isradiated uniformly in all directions and that radio waves incident upon the ground arecompletely absorbed. The magnetic field amplitude of the signal at that point, in nT, is closest to:

37) An 800-kHz radio signal is detected at a point 8.5 km distant from a transmitter tower. Theelectric field amplitude of the signal at that point is 900 mV/m. Assume that the signal power isradiated uniformly in all directions and that radio waves incident upon the ground arecompletely absorbed. The average electromagnetic energy density at that point is closest to:

38) An 800-kHz radio signal is detected at a point 2.7 km distant from a transmitter tower. Theelectric field amplitude of the signal at that point is 360 mV/m. Assume that the signal power isradiated uniformly in all directions and that radio waves incident upon the ground arecompletely absorbed. The intensity of the radio signal at that point is closest to:

A) 3.8 ! 105 WB) 2.7 ! 105 WC) 4.5 ! 105 WD) 3.2 ! 105 WE) 5.0 ! 105 W

39) An 800-kHz radio signal is detected at a point 9.1 km distant from a transmitter tower. Theelectric field amplitude of the signal at that point is 440 mV/m. Assume that the signal power isradiated uniformly in all directions and that radio waves incident upon the ground arecompletely absorbed. The average total power radiated by the transmitter is closest to:

A radiometer has two square vanes (1 cm by 1 cm), attached to a light horizontal cross arm, and pivoted about a verticalaxis through the center. The center of each vane is 6 cm from the axis. One vane is silvered and it reflects all radiantenergy incident upon it. The other vane is blackened and it absorbs all incident radiant energy. Radiant energy, which hasan intensity of 300 W/m2, is incident normally upon the vanes.

Figure 32.1


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-10 Pa

B) 1 ! 10-6 Pa

C) 1 ! 10-7 Pa

D) 1 ! 10-9 Pa

E) 1 ! 10-8 Pa

B) 6 ! 10-12 N " m

C) 1.8 ! 10-11 N " m

D) 1.2 ! 10-11 N " m

E) 2.4 ! 10-11 N " m

41) In Fig. 32.1, the radiation pressure on the blackened vane is closest to:A) 1 ! 10

42) In Fig. 32.1, the torque on the vane assembly, about the vertical axis, is closest to:A) zero

A) 7.5 ! 1014 HzB) 5.5 ! 1014 HzC) 15 ! 1014 HzD) 4.3 ! 1014 HzE) 8.3 ! 1014 Hz

43) The wavelength of visible light ranges from 400 nm to 700 nm. The highest frequency of visiblelight is closest to:

B z = (1.25 µT) cos[(3800 m-1)x - (1.14 ! 1012

y-component of the electric field can be is closest to:A) 375 N/CB) 1.25 ! 106 N/C

C) 4.17 ! 10-9 N/C

D) 4.17 ! 10-15 N/CE) 3.75 ! 108 N/C

44) If the z-component of the magnetic field of an electromagnetic wave traveling in the x-directionthrough vacuum obeys the equation

rad/s)t],then the largest that the

40) In Fig. 32.1, the radiant power absorbed by the blackened vane is closest to:A) 0.03 W B) 0.06 W C) 0.05 W D) 0.04 W E) 0.09 W

Situation 32.1A microwave oven operates at a frequency of 2400 MHz. The height of the oven cavity is 25 cm and the base measures 30cm by 30 cm. Assume that microwave energy is generated uniformly on the upper surface of the cavity and propagatesdirectly downward toward the base. The base is lined with a material that completely absorbs microwave energy. Thetotal microwave energy content of the cavity is 0.50 mJ.

45) In Situation 32.1, the power output of the microwave oven is closest to:A) 700 W B) 550 W C) 600 W D) 650 W E) 500 W


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2

B) 7200 W/m2

C) 6200 W/m2

D) 6700 W/m2

E) 5700 W/m2

B) 2500 V/mC) 1900 V/mD) 2200 V/mE) 2800 V/m

47) In Situation 32.1, the electric field amplitude is closest to:A) 1600 V/m

-6 N

B) 3.0 ! 10-6 N

C) 2.5 ! 10-6 N

D) 3.5 ! 10-6 N

E) 1.5 ! 10-6 N

48) In Situation 32.1, the force on the base due to the radiation is closest to:A) 2.0 ! 10

14 Hz laser emits a 8.7-µs pulse, 5.0 mm in diameter, with a beam energy density of0.21 J/m3. The number of wavelengths in the length of the beam is closest to:A) 6.8 ! 1010

B) 2.0 ! 109

C) 2.0 ! 1011

D) 2.0 ! 1010

E) 6.8 ! 109

49) A 7.8 ! 10

14 Hz laser emits a 2.0-µs pulse, 5.0 mm in diameter, with a beam energy density of0.75 J/m3. The power emitted by the laser is closest to:A) 4.4 kW B) 13 kW C) 22 kW D) 8.9 kW E) 18 kW

50) A 2.7 ! 10

14 Hz laser emits a 7.7-µs pulse, 5.0 mm in diameter, with a beam energy density of0.51 J/m3. The amplitude of the electric field of the emitted waves is closest to:A) 1.2 ! 105 V/m

B) 4.8 ! 105 V/m

C) 2.4 ! 105 V/m

D) 1.5 ! 105 V/m

E) 3.4 ! 105 V/m

51) A 7.5 ! 10

14 Hz laser emits a 9.7 µs pulse, 5.0 mm in diameter, with a beam energy density of0.85 J/m3. The average Poynting vector magnitude of the beam is closest to:A) 6.4 ! 107 W/m2

B) 9.0 ! 107 W/m2

C) 2.6 ! 108 W/m2

D) 1.8 ! 108 W/m2

E) 1.3 ! 108 W/m2

52) A 8.6 x 10


46) In Situation 32.1, the intensity of the microwave beam is closest to: A) 5200 W/m

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Situation 32.2A standing planar electromagnetic wave is established in a resonant cavity formed by two parallel conducting plates thatare 12 cm apart. The number of electric field antinoidal planes, including the cavity walls, in the standing wave is three.

9), is closestto:A) 5.00 B) 3.75 C) 6.25 D) 2.50 E) 1.25

53) In Situation 32.2, the frequency of the electromagnetic wave in GHz (G = giga = 10

A) zero B) 2.0 C) 1.0 D) 3.0 E) 4.0

54) In Situation 32.2, the number of antinoidal planes for the magnetic field is:A) 4 B) 3 C) 5 D) 6 E) 2

55) In Situation 32.2, the smallest distance between an electric field antinoidal plane and a magneticfield antinoidal plane, in cm, is closest to:

A) 2.07 B) 1.44 C) 3.66 D) 1.98 E) 1.20

A) 15.5 GHz B) 4.42 GHz C) 18.8 GHz D) 12.4 GHz E) 3.30 GHz

56) A certain glass has an index of refraction of 1.44 at a wavelength of 560 nm in vacuum. What isthe effective dielectric constant at the corresponding frequency?

57) Electromagnetic standing waves are set up in a conducting cavity resonator in the form of ahollow metal box. The waves bounce back and forth between two parallel surfaces separated by0.80 cm. What is the minimum resonant frequency for such a resonator?

Situation 32.3The y-component of the electric field of an electromagnetic wave traveling in the +x-direction through vacuum obeys theequation

E y = (375 N/C) cos[ks - (2.20 ! 1014 rad/s)t].

closest to:A) 1.36 µTB) 1.25 µTC) 1.13 ! 1011 T

D) 1.70 ! 10-12 TE) 0.00 µT

58) In Situation 32.3, the wavelength of the electromagnetic wave is closest to:A) 2.72 µm B) 1.36 µm C) 8.57 µm D) 17.1 µm E) 0.272 µm

59) In Situation 32.3, the largest that the x-component of the magnetic field of the wave can be is

A) 1.70 ! 10-12 TB) 1.25 µTC) 0.00 µTD) 1.36 µTE) 1.13 ! 1011 T

60) In Situation 32.3, the largest that the z-component of the magnetic field of the wave can be isclosest to:


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62. An electromagnetic wave is generated by: A) any moving charge B) any accelerating charge C) only a charge with changing acceleration D) only a charge moving in a circle E) only a charge moving in a straight line

63. The index of refraction of a substance is: A) the speed of light in the substance B) the angle of refraction C) the angle of incidence D) the speed of light in vacuum divided by the speed of light in the substance E) measured in radians

64. Which diagram below illustrates the path of a light ray as it travels from a given point X in air to another given point Y in glass?

61. Consider: radio waves (r), visible light (v), infrared (i), x-rays (x), and ultraviolet (u). In order of decreasing wavelength, they are: A) r, v, i, x, u B) r, i, v, u, x C) i, r, v, u, x D) i, v, r, u, x E) r, i, v, x, u

A) v1 > v2 > v3

B) v3 > v2 > v1

C) v3 > v1 > v2

D) v2 > v1 > v3E) v1 > v3 > v2

65. A ray of light passes through threemedia as shown. The speeds of light in these media obey:

A) I B) II C) III D) IV E) V

66. Radio waves of wavelength 300 m have a frequency of: A) 10–6 kHz B) 500 kHz C) 1 MHz D) 9 MHz E) 108 kHz

67. A clear sheet of polaroid is placed on top of a similar sheet so that their polarizing axes make an angle of 30° with each other. The ratio of the intensity of emerging light to incident unpolarized light is: A) 1:4 B) 1:3 C) 1:2 D) 3:4 E) 3:8

if the emerging light has intensity I0/4: A) sin–1(1/2)

B) ( )sin−1 1 5

C) cos–1(1/2)

D) ( )cos−1 1 2

E) tan–1(1/4)

68. An unpolarized beam of light has intensity I0. It is incident on two ideal polarizing sheets. The angle between the axes of polarization of these sheets is θ . Find θ


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A) (sin a)/(sin b) = 2.5 B) (sin b)/(sin d) = 2.5 C) (cos a)/(cos c) = 2.5 D) (sin a)/(sin c) = 1/(2.5) E) a/c = 2.5

69. The index of refraction for diamond is 2.5. Which of the following is correct for the situation shown?

71. The separation of white light into colors by a prism is associated with: A) total internal reflection B) partial reflection from each surface C) variation of index of refraction with wavelength D) a decrease in the speed of light in the glass E) selective absorption of various colors

70. The index of refraction of benzene is 1.80. The critical angle for total internal reflection, at a benzene-air interface, is about: A) 56° B) 47° C) 34° D) 22° E) 18°

72. A 5.0-ft woman wishes to see a full length image of herself in a plane mirror. The minimum length mirror required is: A) 5 ft B) 10 ft C) 2.5 ft D) 3.54 ft E) no answer: the farther away she stands the smaller the required mirror length

73. A parallel beam of monochromatic light in air is incident on a plane glass surface. In the glass, the beam: A) remains parallel B) undergoes dispersion C) becomes diverging D) follows a parabolic path E) becomes converging

74. The image produced by a convex mirror of an erect object in front of the mirror is always: A) virtual, erect, and larger than the object B) virtual, erect, and smaller than the object C) real, erect, and larger than the object D) real, erect, and smaller than the object E) none of the above

75. An erect object is located between a concave mirror and its focal point. Its image is: A) real, erect, and larger than the object B) real, inverted, and larger than the object C) virtual, erect, and larger than the object D) virtual, inverted, and larger than the object E) virtual, erect, and smaller than the object


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310

(A) 54 10 w (B) 42.56 10 w (C) 56.4 10 w (D)

(A)530kHz to 1710kHz (B)54MHz to 890MHz

(C) 3GHz to 300GHz (D) 144 10 Hz to

(78) Range of frequency of microwaves is about__________.

(A) coulomb (B)ampere (C)faraday (D)

71014 Hz

(79) SI unit of displacement current is

(A) infrared rays (B) ultraviolet rays (C) x rays (D) rays

1.6105 w

(77) Bolometer is used to detect ___________.

(76) The sum delivers Wm-2 of electromagnetic flux to earth’s surface. The totalpower that is incident on a roof of dimension 8m x 20m will be________

(80) The frequencies of x rays, rays and ultraviolet rays are respectively p, q and rthen

(A)p<q, q>r (B) p>q, q>r (C)p>q, q<r (D)p<q, q<r

(81) At room temperature, if the relative permitivity of water is 80 and the realtivepermiability be 0.0222 then the velocity of light in water is ___________m/s

(B)(A) (C) 2.5108 (D) 2.25108 3.5108 3108

(82) If the electric field associated with a radiation of frequency 10MHz is E=10sin(kx-ω t)mV/m then its energy density is______ εo=8.85×10 -12C 2 N -1m -2Jm3 (

(83) In an electromagnetic wave in free space, the direction of electric field vector E

8.8510144.4251016 (B) 6.261014 (C)8.851016

(D)

)

(A)

is along z axis then which of the

is along y axis and magnetic field vector B

following is true

(A) E B E

(B) E B B

(C) E B B 0

(D) none of these

2.01010 Hz. if the peak value of electric field is 60Vm1 the averageenergy density (in Jm-3) of the magnetic field of the wave will be(given o = 4 107 Tm/A)

(A) 2 107 (B)1 7

210 (C) 4 107 (D)

1 7

410

(85) In a plane electromagnetic wave , the electric field oscillates sinusoidaly at afrequency of

(A)1 2

4 oEo (B)1 2

2oEo (C) 2 oEo2 (D) 4 oEo2

(84) When a plane electromagnetic wave travels in vaccum, the average electric energydensity is given by (Eo is the amplitude of the electric field)


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would generate a plane electromag-

netic wave travelling in +ve y direction

(86) Which of the following pairs of the component of space and time varying

E i, B iz x(D) E i, B ix x(C) E i, B iy z(B) B i, E ix z(A)

B = B i + Byj + Bzk ˆ ˆ ˆ

and x E = Ε i + Eyj + Ezk

ˆ ˆ ˆ x

(87) Infrared radiations are detected by(A) spectrometer (B)bolometer (C)photocells (D)geiger tubes

(D) E

(C) B

(B) E

.

(A) E

and B

(88) Electromagnetic wave is produced by oscillating electric and magnetic fields E

. Choose only the incorrect statement from the following

is perpendicular to B

is perpendicular to the direction of propagation of the wave

is perpendicular to the direction of propagation of the wave

is parallel to B

(89) The potential difference between the plates of a parallel plate capacitor is charg-ing at the rate of

106Vs1 . If the capatance is 2 F . The displacement current in the dielectric of the capacitor will be

(A) 4A (B)3A (C)2A (D)1A

(90) Which of the following electromagnetic wave has the least frequency?

(A) radiowave (B) infrared radiation (C)microwave (D)x rays(91) Which of the following electromagnetic wave has the least wavelength?

(92) Which of the following waves are not transverse in nature?(A) light emitted from a sodium lamp(B) sound waves travelling in air(C) xrays from an x ray machine(D) microwaves used in radar

(93) An electromagnetic wave(A) can be deflected by electric field(B) can be deflected by magnetic field(C) can be deflected bye both electric and magnetic field(D) none of these

(94) When an electromagnetic wave encounters a dielectric medium, the transmittedwave has(A) same frquency but different amplitude(B) same amplitude but different frequency(C) same frequency and amplitude(D) different frequency and amplitude

(A) rradiowave (B)visible wave (C) ultraviolet rays (D)micro-waves


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(A) (99) The dimensional formula of energy density is

(98) _________ is responsible for the green house effect(A) infrared rays (B)ultraviolet rays (C)x raya (D)radiowaves

(97) If the earth were not having atmosphere, its temperature________.

(A) would have been low (B) would have been high(C)would hav remain constant (D) none of these

(96) ______was the first to predict the existence of electromagnetic waves(A) Maxwel (B) Faraday (C)Ampere (D) hertz

(95) According to Maxwell, a changing electric field produces_____(A) emf (B)radiation pressure(C) electric current (D)magnetic field

M 1L0T 2 (B) M 1L1T 2 (C) M 1L1T 3 (D) M 1L0T 3

100) Unit of oC is same as that of(A)current (B)resistance (C)electric charge (D) velocity


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29) D 30) D 31) D 32) A33) A 34) A 35) D 36) B37) C

Answer

1.b 2. c 3. e 4. c 5. b 6. c 7. a 8. a 9. c 10. c 11. c 12. c 13.d 14. d 15. b 16. d 17. a 18. b 19. c 20. d 21. a 22. b 23. c 24. e25. a 26. c 27. c 28. d

86

B

87

A

88

B

89

D

90

C

91

A

92

C

93

B

94

D

95

A

96

D

97

A

98

A

83

A

84

C

85

A

78

D

77

76AC

82

79 B80 A81 B

61.B 62.B 63.D 64.E 65. C 66.C67.E68.D69.D70.C71.C72.C73.A74.B75.C

38) A39) B40) A41) B42)B43) A44) A45) C46)D47) D48) A49) E50) A51) E52) C53) B54)A55)B56) A57) C58) C59) E60)B

A

99 BB100


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睷眮楢楯歡慲攮捯m - ibiokaare...radiated uniformly in all directions and that radio waves...

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