Republic of the Philippines

Department of Education Regional Office IX, Zamboanga Peninsula

Zest for Progress Zeal of Partnership

10

SCIENCE Grade10

Quarter 2 – Module 1

ELECTROMAGNETIC WAVES

Name of Learner: ___________________________

Grade & Section: ___________________________

Name of School: ___________________________

2

What I Need to Know

When you were in Grade 7, you were able to demonstrate understanding of the

characteristics of light by explaining color and intensity of light in terms of its wave

characteristics. In Grade 8, you grasped the knowledge about some of properties and

characteristics of light by explaining the hierarchy of colors in relation to the energy of

visible light. This time, it will be all about comparing the relative wavelengths of different

forms of electromagnetic waves.

Have you ever tried sending messages, cooking in a microwave, listening radio or

watching TV today? Have you ever tried to ask yourself “What makes this possible?”. As

you go along this module, you will able to answer that BIG question.

Content Standard

The different regions of electromagnetic Spectrum

Most Essential Learning Competency (MELC)

Compare the relative wavelengths of different forms of electromagnetic wave

(S10FE 11a-b-470)

Specific Objectives:

a. Trace the development of the electromagnetic wave theory

b. Describe how electromagnetic wave is produced and propagated.

Module

1 Electromagnetic Waves

3

What’s In

Let us recall the dispersion of light that you learned in Grade 8. This is when white light

splits into many colors as it passes through a prism, thus creating a rainbow.

Trivia: A rainbow is caused by sunlight and atmospheric conditions. Light enters a water

droplet, slowing down and bending as it goes from air to denser water. The light reflects

off the inside of the droplet, separating into its component wavelengths--or colors. When

light exits the droplet, it makes a rainbow.

(Source: https://scijinks.gov/rainbow/#:~:text=A%20rainbow%20is%20caused%20by,droplet%2C%20it%20makes%20a%20rainbow.)

ACTIVITY 1: SHINE LIKE RAINBOW!

Directions: In the left box below, write the 7 colors of the rainbow arranged from

top to bottom in the space provided (0.5 point each). In the right box below, write T if the

statement about energy, frequency and wavelength is true and F if the statement is false

(1 point each).

1. RED

2. ____________

3. YELLOW

4. ____________

5. ____________

6. INDIGO

7. ____________

___1. Red light has the highest frequency.

___2. Violet has the highest energy.

___3. Violet has the longest wavelength.

___4. The higher the frequency of light, the greater the energy.

___5. The longer the wavelength, the lesser the frequency of

light.

___6. Wavelength is directly proportional to frequency.

___7. Frequency is inversely proportional to energy.

___8. Wavelength is inversely proportional to energy.

Score: ____ 12

4

What’s New

ACTIVITY 2A: MATCH ME!

Directions: Match the scientists given below with their contributions. Write the

letter of the correct answer in the space provided before each number.

Scientists Contributions

______1.Ampere a. Contributed in developing equations that showed

the relationship of electricity and magnetism

_____2. Faraday b. Showed experimental evidence of electromagnetic

waves and their link to light

_____3. Hertz c. Demonstrated the magnetic effect based on the

direction of current

_____4. Maxwell d. Formulated the principle behind electromagnetic

induction

_____5. Oersted e. Showed how a current-carrying wire behaves like a

magnet

ACTIVITY 2B. LET’S TALK ABOUT EM!

Directions: Write T if the statement is True, F if the statement is false. (1 point each)

_______1. Electromagnetic waves transfer energy through vacuum.

______ 2. A wave is a disturbance that transfers energy

______ 3. Most EM waves are invisible and undetectable.

______ 4. The electric field and the magnetic field oscillate parallel to each other

______ 5. As wavelength increases, the frequency of wave also increases.

Score: ____ 5

Score: ____ 5

5

What Is It

In the previous activity, you matched the scientists with their contributions

on the discoveries of electricity and magnetism and the development of

Electromagnetic wave theory. Hoping that you got them right. Take a look at this.

.

James Clerk Maxwell

1831-1879

Andre-Marie Ampere

1775-1836

Hans Christian Oersted

1777--1851

Showed how a current

carrying wire behaves like

a magnet.

Formulated the principle

behind electromagnetic

induction.

Contributed in developing

equations that showed the

relationship of electricity and

magnetism.

Showed experimental

evidence of electromagnetic

waves and their link to light.

Demonstrated the

magnetic effect based on

the direction of current.

Michael Faraday

1791-1867

Source:en.wikipedia.org/wiki/Michael_Faraday

Heinrich Hertz

1857--1894

Source:https://en.wikipedia.org/wiki/Heinrich_Hertz

Source:https://www.britannica.com/biograph

y/AndreMarie-Ampere/media/1/21416/8352

Source:thoughtco.com/james-clerk-

maxwell-inventor1991689

Source:aps.org/publications/apsne

w/200807/physicshistory.cfm

6

Electromagnetic Waves

Accelerating electrons produce electromagnetic (EM) waves. These waves are

a combination of electric and magnetic fields. A changing magnetic field produces an

electric field and a changing electric field produces a magnetic field. As accelerated

electrons produce an electric field of a wave, the varying electric field produces the wave’s

magnetic field. Both the electric field and the magnetic field oscillate perpendicular to each

other and to the direction of the propagating wave. Therefore, electromagnetic waves are

transverse waves, as shown in Figure 1.

Figure 1. Electromagnetic Wave Propagation

Among the examples of EM waves are radiowaves, microwaves, infrared, visible

light, ultraviolet, x-rays and gamma rays. All EM waves travel at a speed of 3 X 108 m/s

in a vacuum and denoted as c, the speed of light.

Since all the electromagnetic waves have the same speed, as wavelength

decreases, the frequency of the wave increases as expressed in the equation

v=λf

where: v is the wave speed, or c (speed of light) expressed in meter per second,

f is the frequency expressed in Hertz

λ is the wavelength expressed in meters

Speed

All electromagnetic waves travel at a speed of 300,000 km/s (3 x 108m/s) in a

vacuum of space. However, when electromagnetic waves travel through matter, they slow

down. The speed of the wave depends upon the material they travel through.

7

Electromagnetic waves usually travel the slowest in solids and the fastest in gases, as

shown in Table 1 below.

Material Speed (Km/s)

Vacuum 300,000

Air Slightly less than 300,000

Water 226,000

Glass 200,000

Diamond 124,000

Table 1. Speed of Visible Light

Frequency

The frequency, represented by the Greek letter nu (ν), is the number of waves

that pass a certain point in a specified amount of time. Typically, frequency is measured

in units of cycles per second or waves per second. One wave per second is also called a

Hertz (Hz) and in SI units is a reciprocal second (s−1).

Example Problem 1: (Assume that the waves propagate in a vacuum.)

1. What is the frequency of radio waves with wavelength of 20 m?

Given: v= c = 3 X 108 m/s

λ= 20 m

f= ?

Equation:

v=c=λf

Solution:

f=c/λ = 3 X108 m/s

20 m

= 1.5 X 107 Hz

Wavelength

Wavelength is defined as the distance measured from one crest of a wave to the

next crest or from one through to the second through.

A wave cycle

consists of one complete

wave—starting at the zero

point, going up to a wave

crest, going back down to a

wave trough, and back to

the zero point again. The

wavelength of a wave is the Figure 2. The wavelength

8

distance between any two corresponding points on adjacent waves. It is easiest to

visualize the wavelength of a wave as the distance from one wave crest to the next. In an

equation, wavelength is represented by the Greek letter lambda (λ). Depending on the

type of wave, wavelength can be measured in meters, centimeters, or nanometers (1 m

= 109 nm). To find wavelength ( λ ), use this equation v=λf

Example Problem 2:

1. What is the wavelength of an electromagnetic wave that has a frequency of 4.95×1014 Hz?

Given : f = 4.95 x 1014 Hz v= c=3.00 x 108 m/s λ =? Equation: v=λf

What’s More

ACTIVITY 3: SOLVE ME!

Directions: Solve the problem. Write all your solutions and answers on the space provided after the question.

1. Calculate the wavelength of a photon that has a frequency of 2.5 x 1012Hz. (5

points) .

2. What is the frequency of an electromagnetic wave having a wavelength of 300,000 km? (5 points)

Score: ____ 10

Solution: λ=v/f = 3.00 x 108 m/s /

4.95 x 1014Hz = 6.06×10-7m

9

What I Have Learned

ACTIVITY 4: FILL ME!

Direction: Complete the statements below by filling in with correct word(s) found in the

box. (1 point each)

magnetic field Maxwell perpendicular

electric field Faraday transverse

electromagnetic wave theory vacuum

electromagnetic waves 3x108m/s

1. A changing magnetic field produces an ___________.

2. A changing electric field produces a ______________

3. The successive production of electric and magnetic field results to the creation of

_______________________wave.

4-5. The electric and magnetic fields vibrate _______________to each other to the

direction the wave travels so it is a _________________________ wave.

6. James Clerk Maxwell formulated the ___________________- which says that an

oscillating electric current should be capable of radiating energy in the form of

electromagnetic waves.

7. The one who formulated the principle behind electromagnetic induction was

_____________.

8. ___________________ contributed in developing equations showing the relationship

of electricity and magnetism.

9-10. EM waves can travel through a ____________ with a speed value of

__________________.

Score: ____ 10

10

What I Can Do

ACTIVITY 5: COMPLETE ME!

Directions: Complete the concept map (1 point each)

Can travel through

Have

properties

of

Defined as

SI unit

Electromagnetic

radiation

Distance

between wave

crests

Score: ____ 10

X-rays

Defined as

Spectrum

which includes

Transfers kinetic

energy in form of

Range is called

the

Defined as

SI unit

Hertz

11

Assessment

MULTIPLE CHOICE

Directions: Identify the letter of the choice that best completes the statement or answers

the question. Write the letter on the space provided before each number.

____1 Who formulated the principle behind electromagnetic induction?

a. Faraday

b. Hertz

c. Ampere

d. Maxwell

____2. In the electromagnetic wave, the direction of the propagation of the wave

is_____.

a. always to the right

b. always to the left

c. parallel to electric and magnetic field directions

d. perpendicular to the electric and magnetic field directions

____3. Which of the following is the contribution of Oersted in the development of

Electromagnetic Wave Theory?

a. demonstrated the magnetic effect based on the direction of current

b. showed how a current carrying wire behaves like a magnet

c. showed how experimental evidence of electromagnetic waves and their

link to light

d. contributed in developing equations that showed the relationship of

electricity and magnetism.

____4. The following are the properties of Electromagnetic waves EXCEPT_______.

a. EM waves can travel through a vacuum

b. EM waves travel at the speed of 3 x 108 m/s

c. EM waves have an electric field and magnetic field which vibrate

parallel to each other

d. As wavelength of EM wave decreases, its frequency increases.

Score: ____ 10

12

____5. The source of all electromagnetic wave is

a. magnetic fields

b. heat

c. electric fields

d. vibrating charges

____6. Which of the following is NOT an electromagnetic wave?

a. Sound

b. Radio

c. Light

d. Infrared

____7. How far is a light-second?.

a. 5000 km

b. 300,000 km

c. 4,000,000 km

d. 50,000,000 km

____8. What is the wavelength of an electromagnetic wave that has a frequency of 1

Hz?

a.More than 1 m

b.Less than 1 m

c.1 m

d Cannot be determined

____9. What is the frequency of an electromagnetic wave having a wavelength of

300,000km?

a. More than 1 Hz

b. Less than 1 Hz

c. 1 Hz

d. Cannot be determined

13

_____10. What is the wavelength of the wave with a frequency of 3 x 109 Hz?

a. 1.0 x 10-1 m

b. 1.0 x 101 m

c. 1.0 x 10-2 m

d. 1.0 x 102 m

Additional Activity

Directions: Make a Comic Strip about the scientist contributions on the development of

electromagnetic wave theory. Refer to the rubric below for your guidance in making your

output.

5 4 3 2

Content Concept is clearly evident.

Concept is evident;

Concept is acceptable:

Concept is limited;

Spelling and Grammar

There are no spelling, punctuation or grammar errorsNo errors

There are 1-3 spelling, punctuation or grammar errors

There are 4-5 spelling, punctuation or grammar errors

There are more than 5 spelling, punctuation, and grammar errors

Visual Effect Comic strip is incredibly exciting and interesting

Comic strip is very exciting and interesting

Comic strip is quite exciting and interesting

Comic strip is not interesting and exciting

Table 2. Rubric for Comic Strip

Score: ____ 15

Remember:

A comic strip is a sequence of drawings in boxes that tell an amusing story, or a

form of story-telling, which uses drawings or cartoon characters to tell a story.

14

Key to Answers

Grade 10Q2W1 Science

Pre-test

1.A

2.D

3.B

4.C

5.D

6.A

7.B

8.C

9.C

10.A

Activity 1: Shine Like Rainbow

1. Red 1. F

2. Orange 2. T

3. Yellow 3. F

4. Green 4. T

5. Blue 5. T

6.Indigo 6. F

7. Violet 7. F

8. T

Activity 2

A: M

AT

CH

ME

!

1.C

2.D

3.B

4.A

5.E

Activity 2

B: L

ET

’S T

AL

K A

BO

UT

EM

!

1.T

2.T

3.F

4.F

5.F

Act

ivit

y 3

: So

lve

Me!

1. 1

.2 x

10

-4H

z

2. 1

.Hz

Activity 4: FILL ME!

1.Electric Field

2. Magnetic Field

3. Electromagnetic Wave

4. Perpendicular

5. Transverse

6. Electromagnetic Wave

Theory

7. Faraday

8. James Clerk Maxwell

9. Vacuum

10. 3.0 X 108m/S

Asse

ssm

en

t

1.A

2. D

3. B

4. C

5. D

6. A

7. B

8. C

9. C

15

`

Can travel through

which includes

Electromagnetic

Radiation

Transfers kinetic

energy in form of

Range is called

the

Have

properties

of

Defined as

Defined as

SI unit

SI unit

Distance between

wave crests

Hertz

X-Rays

Defined as

Wavelength

Frequency

Electromagnetic

Waves

ELECTROMAGNETIC

SPECTRUM

Radiowaves

Microwaves

Infrared

SS

Visible Light

SS

Ultraviolet

SS

Gamma Rays

SS

Number of waves

per second

Meter

Vacuum

Vibrating electric and

magnetic field

moving through

space that carries

energy

Activity 5: COMPLETE ME!

16

References

Books Robert L. Weber et.al. College physics. The McGraw Hill Companies. 5th ed. Herma D. Acosta et.al. Science Grade 10 Learners Material.Pasig City. Department of Education-Instructional Materials Council Secretariat (DepEd-IMCS), 2015. Herma D. Acosta et.al. Science Grade 10 Teachers Guidl.Pasig City. Department of Education-Instructional Materials Council Secretariat (DepEd-IMCS), 2015. Publications Joly C. Baradero. Weaving the Wave Learning. A Strategic Intervention Material for Grade 10-

Science.2nd quarter. Nilo Nhs /Tigbao District. Anjaylo B. Pascua. Gotta Catch ’EM All. A strategic IMs for Grade-10 Science. 2nd quarter. Websites https://imagine.gsfc.nasa.gov/science/toolbox/emspectrum1.html https://www.britannica.com/science/electromagnetic-spectrum https://www.teachengineering.org/lessons/view/clem_waves_lesson04 https://scijinks.gov/rainbow/#:~:text=A%20rainbow%20is%20caused%20by,droplet%2C%20it%20makes

%20a%20rainbow.) Images https://en.wikipedia.org/wiki/Heinrich_Hertz https://www.britannica.com/biography/AndreMarie-Ampere/media/1/21416/8352 aps.org/publications/apsnew/200807/physicshistory.cfm thoughtco.com/james-clerk- maxwell-inventor1991689 en.wikipedia.org/wiki/Michael_Faraday electromagnetic spectrum - https://www.researchgate.net

Development Team Mi Ultimo Adios

Writer: Ruby V. Caperida Editors: Margie Lou C. Jacob Laarni A. Adonis Kathleen Joy B. Padilla Joly C. Baradero Reviewer: Sandy R. Albarico Illustrator: Management Team:

Majarani M. Jacinto, CESO VI SDS-ZDS

Visminda Q. Valde, Ed.D

ASDS

Raymond M. Salvador, Ed.D ASDS

Juliet M. Magallanes, Ed.D

CID Chief

Florencio R. Caballero, DTE EPS-LRMDS

Sandy R. Albarico

EPS-Science

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Adiós, queridos seres, morir es descansar.

Dr. Jose Rizal

JOSE RIZAL

https://imagine.gsfc.nasa.gov/science/toolbox/emspectrum1.htmlhttps://www.britannica.com/science/electromagnetic-spectrumhttps://www.teachengineering.org/lessons/view/clem_waves_lesson04https://scijinks.gov/rainbow/#:~:text=A%20rainbow%20is%20caused%20by,droplet%2C%20it%20makes%20a%20rainbowhttps://scijinks.gov/rainbow/#:~:text=A%20rainbow%20is%20caused%20by,droplet%2C%20it%20makes%20a%20rainbow