P1 Revision cards

P1 Revision Questions

Part 2

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Question 1

• Name 3 ways that microwaves lose their signal in communications?

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Answer 1

• Signal is scattered, weather, interference, no diffraction

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Question 2

• How could you reduce the signal loss of microwaves?

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Answer 2

• Limiting the distance between transmitters, high positioning of transmitters

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Question 3

• Why is it important that scientists publish their results?

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Answer 3 .... of 50

So they can be repeated and tested-to see if it is correct

and develop the theory further

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Question 4

• Describe 2 uses of infrared radiation?

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Answer 4

• Fibre optics, remote controls

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Question 5

• How do thermal imaging cameras work?

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Answer 5 .... of 50

Detect infrared radiation given off

by objects- hot objects give off

more

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Question 6

• What is an analogue signal? What is a digital signal?

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Answer 6

• Analogue- signal that is continuously changing. Digital- Signal that is either on or off

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Question 7

• Name 2 advantages of digital signals

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Answer 7

• Interference can be removed easily, more information can be carried by multiplexing

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Question 8

• How can infrared waves be used to send a message?

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Answer 8

• Pulses of infrared waves are send and are read as binary code

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Question 9

• Why is it easier to remove noise from digital signals?

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Answer 9

• Because they can only have 2 values

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Question 10

• Give 2 properties of fibre optics

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Answer 10 .... of 50

Transmit signals very fast over long distances

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Question 11

• Give 3 uses of wireless technology

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Answer 11

• Radios, phones, laptops

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Question 12

• Name 3 advantages of wireless communication

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Answer 12

• Portable, convenient, access on the move, no direct connection needed (but aerial is

needed)

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Question 13

• What does a digital signal look like?

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Answer 13 .... of 50

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Question 14

• What happens to radio waves when sent up to the ionosphere?

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Answer 14

• They get reflected

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Question 15

• What happens to microwaves when they are sent up to the ionosphere?

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Answer 15

• They go through it and reach a satellite outside the atmosphere

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Question 16

• How does a microwave signal get from one place to another?

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Answer 16 .... of 50

Emitter by transmitter and received by satellite

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Question 17

• Name 2 advantages and 2 disadvantages of DAB radio

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Answer 17

• More radio stations, less interference, poorer audio quality, not all areas covered

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Question 18

• What factors can affect wave communication?

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Answer 18

• Weather conditions, frequency of waves

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Question 19

• How are earthquakes detected? What does this make?

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Answer 19

• Seismometer makes a seismograph

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Question 20

• Name 4 dangers of UV light

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Answer 20

• Cataracts, aging skin, skin cancer, skin burn

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Question 21

• What 3 types of waves do earthquakes make. Give 2 properties of each one

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Answer 21

• L waves- travel along surface.

• P waves- longitudinal, fastest waves, travel through liquids. S waves- transverse, travels

through solids

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Question 22

• Put the waves produced by an earthquake in order from fastest to slowest

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Answer 22

• P waves are fastest, s waves are slowest

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Question 23

• What is meant by a sun cream's SPF?

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Answer 23

• Sun protection factor- how many times longer you can spend in the sun with it on

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Question 24

• How does darker skin reduce skin cancer?

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Answer 24

• Skin absorbs more radiation so it does not reach and damage the cells

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Question 25

• How can we predict the Earth’s structure using seismic waves?

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Answer 25

• P waves can be detected the opposite side of the earth but S waves cannot- as S waves

cannot travel through liquids

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