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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

3

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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Development Team Mi Ultimo Adios

Writer: Johnrie L. Abonales Editors: Margie Lou C. Jacob Laarni A. Adonis Kathleen Joy B. Padilla Joly C. Baradero Reviewer: Sandy R. Albarico Illustrator: Layout Artist: Management Team:

Majarani M. Jacinto, CESO VI SDS-ZDS

Visminda Q. Valde, Ed.D

ASDS

Raymond M. Salvador, Ed.D ASDS

Juliet A. Magallanes, Ed.D

CID Chief

Florencio R. Caballero, DTE EPS-LRMDS

Sandy R. Albarico

EPS-Science

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