Quarter 2 Module 4 Effects of Electromagnetic Radiation
Transcript of Quarter 2 Module 4 Effects of Electromagnetic Radiation
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Republic of the Philippines
Department of Education Regional Office IX, Zamboanga Peninsula
10 Zest for Progress
Zeal of Partnership
SCIENCE Grade 10
Quarter 2 – Module 4
Effects of Electromagnetic Radiation
Name of Learner: ___________________________
Grade & Section: ___________________________
Name of School: ___________________________
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What I Need to Know
After going through this lesson, you are expected to: 1. Explain the effects of electromagnetic radiation in living things and the
environment. (S10FEIIe-f-49)
What’s In
Previously, you studied about how Electromagnetic wave is produced and
propagated and the relative wavelengths of the different regions of the electromagnetic
waves.
Let us check your previous understanding by answering the next activity.
Activity 1: CORRECT ME IF I’M WRONG
Directions: Write T if the statement is true. If it false, change the underlined word to make
the statement true. Write your answer on the space provided before each number. (1pt
each)
______________1. Infrared are used in TV remote controls.
______________2. Speed gun uses X-ray to calculate speed of moving vehicle.
______________3. Microwave can cook food.
______________4. Cell phones uses Infrared to communicate.
______________5. Forge bank money can be detected through UV light.
Module
4
Effects of Electromagnetic Radiation
Score: _____ 10
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3. Newspaper
5. Permanent marker
2. Sunscreen/
Any Sunblock
lotions
What’s New
Signals that humans cannot sense directly can be detected through technological
advances and design. Radios, Televisions, cell phones and wireless computer networks
are examples of such technologies that are beneficial to humans and these are made
possible because of Electromagnetic radiation. But are all of these still beneficial when they
are used excessively? Do the following activity to find out.
Activity 2: SCREEN THE UV OUT Objectives: • Block UV rays of the sun. • Discover the effects of UV rays. Materials: Note:
This activity should be done early in the morning so as to expose the material throughout the day. Procedure: 1. Cut a piece of newspaper to fit snugly inside a Ziploc snack bag.
1. Ziploc snack bag
4. Black construction paper
Score: _____ 15
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2. Outside the Ziploc snack bag, draw two lines with a marker dividing the bag into three equal parts from the top of the bag to the bottom. 3. Cover the middle part with black construction paper 4. Apply a thin coat of sunscreen in the leftmost part.
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5. The right part should be left fully exposed. 6. Place the Ziploc snack bags in a place fully exposed to sunlight. 7. Recover the snack bags in the afternoon.
Guide Questions:
Q1. How does the newsprint vary in the three divisions of the newspaper? (5pts) Answer: _______________________________________________________
______________________________________________________________
______________________________________________________________
Q2. What does this indicate? (5pts) Answer: _______________________________________________________
______________________________________________________________
______________________________________________________________
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Q3. How does this realization impact to your personal life? (5pts)
Answer: _______________________________________________________
______________________________________________________________
______________________________________________________________
What is it
Electromagnetic Radiation
Electromagnetic radiation is a form of energy that is all around us and takes many
forms, such as radio waves, microwaves, X-rays and gamma rays, but visible light is only a
small portion of the EM spectrum, which contains a broad range of electromagnetic
wavelength.
Effects of Electromagnetic Radiation
Radio waves
People can be expose to RF radiation from both natural and man-made sources.
Natural sources include: The Sun and the Outer Space, The sky-including lightning strikes
Man-made sources include: Broadcasting radio and TV signals, cell phone towers and
cellphone, Wi-Fi, Bluetooth and Radar.
If radio frequency radiation is absorbed by the body in large enough amounts, This
can damage the DNA (genes) inside of cell, which can sometimes result in cancer.
Microwaves
Microwave radiations can heat body tissue the same way it heats food. Exposure to
high level of microwaves can cause painful burn. Two areas of the body, the eyes and the
testes are particularly vulnerable to RF heating because there are relatively little blood flow
in them to carry excess heat. Additionally, the lens of the eye is particularly sensitive to
intense heat, and exposure to high level of intense heat can cause cataracts.
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Infrared
Infrared radiation is invisible to the human eye starting from 780 nanometers (the
last wavelength that a human can see). People sometimes call the infrared radiation as heat
radiation instead because a person can sense certain wavelength of it on their skin as
warmth. When exposed to high amount of infrared radiation, it mostly involves thermal effect
on eyes and skin.
Visible light
The visible light radiation can exert various biologic effects such erythema,
pigmentation, thermal damage and free radical production. Additionally, visible light
exposure can cause or exacerbate photodermatoses such as solar urticarial, chronic actinic
dermatosis (CAD) and cutaneous porphyrias.
Sunscreen and sunblock lotion are the mainstay treatment against visible light
problem
Too much light can also damage the retina in your eyes. This can happen when
you look at something very bright, such as the sun.
Ultraviolet
UV rays, either from the sun or from artificial source like tanning beds, can cause
sunburns.
Exposure to UV rays can cause premature aging of the skin and sign of sun damage
such as wrinkles, leathery skin, liver spots. It can also cause eye problems. They can cause
the cornea to become inflamed or burned that can lead to the cataract formation.
X-Ray
X-rays are form of electromagnetic radiation that can penetrate or pass through the
human body and produce shadow like images of bones and some organs.
X-ray can cause mutation in our DNA and therefore, might lead to cancer later in life,
for this reason, X-rays are classified as a carcinogen by WHO and the US government.
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A higher absorbed dose of X-ray radiation means a higher risk for adverse effects
including skin redness, infertility, cataracts, and hair loss
Gamma rays
Gamma rays have the smallest wavelengths and carry the highest amount of energy
and can penetrate in all matters that can change the DNA (gene).
They are produced by the hottest and the most energetic objects in the universe,
such as neutron stars. On earth, gamma waves are generated by nuclear explosion and
lightning.
Gamma rays are known human carcinogens (cancer-causing agents). They can
cause mutation in growing tissues, so unborn babies are very vulnerable.
What’s More
Activity 3: COMPLETING THE TASK
Health Risk
Is Health Risk true (Yes/No)
What are the main risks?
What is/are the common
source/s?
What devices used?
Effects to human
Radio wave can affect your DNA
1. Can damage your DNA (gene) inside of cell
2.
Cellphone, Bluetooth devices
3.
Ultraviolet ray has a negative effect on your skin
yes
4. Sun 5. Skin burn or skin cancer
Score: _____ 22
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Directions: Based from the lesson that you have read about the different types of EM wave
and its effects, complete the table below. Some parts are already filled in for your guide.
(2pts each box)
What I Have Learned
Activity 4: MY EFFECTS
Directions: Pictures below show the different effects of radiation. Identify what type of EM
waves affect them. Choose your answer inside the box and write your answer below each
picture. (1 point each)
1. ____________________ 4.___________________
X-ray affects our DNA
yes
6. Radon gas, Cosmic rays,
Medical x-ray machine, airport security cameras
7.
Gamma ray can damage body tissue
8. can cause mutation in growing tissues
9. Radiography, sterilizer machine
diseases to skin, blood, eye disorders and cancer
Infrared can damage eyes and skin
yes
10. Sun, incandescent bulb, Welding arcs
11. Cataracts, skin burn
Score: _____ 5
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2. ____________________ 5. __________________
3. ____________________
What I Can Do
Activity 5: EM WAVE ANYWHERE
Directions: Read each scenario and answer the questions on the next columns.
(3pts each box)
Scenario
What Electromagnetic wave involved?
What should you do to lessen the effect?
Type of EM waves
Radio wave Visible light
Gamma ray Microwave
Ultraviolet X-ray
Infrared
Score: _____ 18
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One summer day, you
are invited by your friends
to join them on beach
party.
While on the beach,
the sun is shining brightly.
1. 2.
Your parents agreed
that you will go on a week
vacation with your friends.
Every day you call your
parents so that they will
not worry about your
situations.
3. 4.
In a welding shop you
notice a very bright spark
of light, you move closer
to observe and the glary
light makes your vision
blurry.
5. 6.
Assessment
Part A:
Directions: Read and understand fully the statements. Write TRUE if the statement is
correct and FALSE if it is not and change them to make the statement correct. Write your
answers on the space provided before each number. (1pt each)
________________________________ 1. The human eye can detect gamma ray.
________________________________ 2. X-ray is safe for pregnant woman.
________________________________ 3. Radiation is all around us.
________________________________ 4. Large dose of gamma rays can be used to
cure cancer.
Score: _____ 10
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________________________________ 5. Human can sense infrared through warmth.
Part B:
Directions: Read and analyze each item carefully. Encircle the letter that corresponds to
your answer. (1pt each)
6. Looking directly at something very bright such as sun, has a negative effect
on your _____.
a. skin b. eyes c. heart d. lungs
7. Which rays enable us to see?
a. Microwave b. Infrared
c. Ultraviolet d. visible light
8. Which material can be used to protect people from gamma rays? a. Sunblock lotion c. Alcohol b. Soap d. perfume 9. Which type of ray can be felt as warmth? a. Microwave b. Infrared
c. Ultraviolet d. visible light
10. How can UV ray cause skin cancer?
a. Too much exposure UV radiation from the sun can damage the genetic material
in your skin cell.
b. Too low exposure UV radiation from the sun can damage the genetic material in
your skin cell.
c. Exposure from UV rays will hinder the absorption of vitamin D, which can
damage your skin cell.
d. UV rays can cause mutation of skin cells that results to abnormal growth of skin
allergies.
Additional Activities
Activity 6: KNOW ME BETTER
Directions: Answer the following questions briefly. Write your answer in the space provided
after each question. (5 points each)
1. How can infrared radiation be detected if cannot be seen?
Score: _____ 15
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2. What does a radio transmitter do?
3. Why are high frequency electromagnetic waves like gamma rays harmful to living
things?
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Activity 6: KNOW ME BETTER
Students answer may vary
(Sample answer)
1. Infrared can be detected through warmth
in our skin.
2. A radio transmitter can transit signal from
one point to the other and used as
communication such as cell phone towers.
3. gamma rays are harmful to living things
because it carries the highest amount of
energy and can penetrate in all matters that
can change the DNA (gene).
Answer Key – Gr10Q2W4 Science
Pretest: A Pre-Test: B
1. False/ cannot 6. D
2. True 7. A
3. True 8. B
4. False/ can cause cancer 9. A
5. False/ not safe 10. B
. .
Act
ivit
y 5
: EM
WA
VE
AN
YWH
ERE
Stu
den
ts a
nsw
er m
ay v
ary
(Sam
ple
an
swe
r)
1. U
V r
ay, I
nfr
ared
, Vis
ible
ligh
t
2. W
eari
ng
sun
glas
ses
and
lon
g sl
eeve
s,
A
pp
ly s
un
scre
en/s
un
blo
ck lo
tio
n
3. R
adio
wav
e, M
icro
wav
e
4. A
lway
s ch
arge
ph
on
e w
hen
bat
tery
bel
ow
1
0%, A
lway
s u
sed
wir
ed h
ead
set
wh
en
m
akin
g an
d a
nsw
erin
g p
ho
ne
calls
5. U
V r
ay, I
nfr
ared
6. W
eari
ng
dar
k su
ngl
asse
s, w
eld
ing
face
s
hie
ld, s
tay
away
fro
m w
eld
ing
job
s.
Activity 4
: My Effects
1.
X-ray
2.
Gam
ma ray
3.
Infrared
4.
Rad
io w
ave
5.
Ultravio
let
Act
ivit
y 1
: Co
rrec
t m
e if
I’m
wro
ng 1.
Tru
e
2.
Tru
e
3.
Tru
e
4.
Fals
e /
rad
io w
ave
5.
Tru
e
Act
ivit
y 2
: Sc
ree
n t
he
UV
ou
t
Q1
An
sw
er:
Th
e n
ew
sp
rin
t in
th
e fu
lly
exp
ose
d p
art
of
the
new
sp
ap
er
fade
d
mo
re d
ram
atica
lly t
ha
n t
he
oth
er
pa
rts.
Q2
An
sw
er:
It
ind
icate
s t
ha
t su
nlig
ht,
sp
ecific
ally
UV
ra
ys a
ffe
ct
the
pig
me
nts
of
diffe
ren
t ob
jects
.
Q3
An
sw
er:
An
sw
er
ma
y v
ary
Sam
ple
an
sw
er:
I r
ea
lize
d t
ha
t w
e
ne
ed
to p
rote
ct
ou
r skin
fro
m U
V r
ays
by u
sin
g p
rote
ctive
clo
the
s o
r lo
tio
n
tha
t ca
n b
lock s
un
ligh
t.
Activity 3: Completing the task
1. Yes
2. Sun, cell phone towers
3. Can lead to cancer
4. Can damage the DNA (gene) inside cell
5. UV lamp, Arc welding
6. Can cause DNA mutation
7. Vomiting, bleeding, fainting, hair loss
8. Yes
9. Nuclear explosion, lightning
10. Can heat body tissue and cause painful burn
in your skin.
11. Arc welding, Sun, Incandescent lamp
Assessment
Part A: Part B:
1. False/ cannot 6. D
2. False/ not safe 7. A
3. True 8. B
4. False/ can cause cancer 9. A
5. True 10. B
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References
Books:
Glencoe Physics Principles & Problems. The McGraw-Hill Companies, Inc., 2013 Kirkpatrick et. al. Physics: A World View, International Student Edition. The Tomson
Corporation, 2007. Littell, McDougal. Science, Integrated Course 1, Teacher’s Edition. Evanston, Illinois:
McDougal Littell, 2005. Padua, AL., Crisostomo RM., Practical and Explorational Physics Modular Approach.
Vibal Publshing House, Inc., Copyright 2003 Yong, et al. Physics Insights, Low Price Edition. Jurong, Singapore: Pearson Education
(Asia) Pte Ltd. Electronic sources:
https://www.livescience.com/38169-electromagnetic.html
https://www.fda.gov/radiation-emitting-products/resources-you-radiation-emitting-
products/microwave-oven-radiation
https://science.nasa.gov/ems/12_gammarays
https://www.tooelu.ee/en/Employee/Working-environment/Hazards-of-the-working-
environment/Physics-hazards/Infrared-Radiation
https://www.nature.com/articles/eye2015218
https://www.cancerresearchuk.org/about-cancer/cause-of-cancer/sun-uv-and-cancer/how-
does-the-sun-and-uv-cause-cancer
https://www.medicalnewstoday.com/articles/219970#side-effects
https://www.cancer.org/cancer/cancer-causes/radiation-exposure/x-ray-gamma-rays/do-
xrays-and-gamma-rays-cause-cancer.html
https://images.app.goo.gl/QpJGahwg11e5U28e7
https://images.app.goo.gl/7jqCXGwrtRYbbi2R8
https://images.app.goo.gl/Exttkajh8GE3a1eL8
https://images.app.goo.gl/bCKsrB6GcEW58gM18
https://images.app.goo.gl/nhP7uB13UteFaUX8
https://images.app.goo.gl/G5pK1wRp8nmDe4uH6
https://images.app.goo.gl/Gj3qtrCjzmm5wfLo7
https://images.app.goo.gl/w2jsxGFuDWBEca2r5
https://images.app.goo.gl/2PZHPhsUi41KSEKi8
https://images.app.goo.gl/JKrhUSMMLoBawTbM8
https://images.app.goo.gl/2ZEcWKdvT1YqZW1C8
https://images.app.goo.gl/M7K36mLk8pifrHZB9
https://www.indiamart.com/proddetail/marker-pen-18197734273.html
https://fr.123rf.com/photo_48223439_cr%C3%A8me-solaire-plat-ic%C3%B4ne-
isol%C3%A9-sur-fond-blanc.html
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CID Chief
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EPS-Science
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