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Science 10
Learning Activity Sheets
Quarter 2-Week 1

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Most Essential Learning Competency

Compare the relative wavelengths of different forms of electromagnetic waves.

(S10FE-IIa-b-47)

Specific Objectives:

1. Explain how an electromagnetic wave is produced;

2. Identify the different electromagnetic waves; and
3. Describe each form according to their energy level, frequency, and wavelength.

KIMBERLY MAE A. SANCHEZ

Writer/Developer
La Union National High School

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Name: __________________________________ Grade & Section: ___________________
School: ___________________________________________________________________
Teacher: __________________________________________________________________

What I Need to Know (Concept)

A wave is a disturbance that transfers energy. An oscillating charge will produce an

oscillating electric field, which in return produces an oscillating magnetic field.
Electromagnetic waves or electromagnetic radiations, are produced by oscillating electric
charges, with the electric field and the magnetic vibrating perpendicularly to each other and to
the direction of wave propagation. Hence, electromagnetic waves are transverse waves.

Figure 1. Electromagnetic Wave

In 1862, James Clerk Maxwell predicted the existence of electromagnetic waves.

Through the efforts of Heinrich Hertz that those waves (other than light) were observed to exist.
Heinrich Hertz discovered the Hertzian waves which is now known as radio waves. Hertz is
the unit to measure the frequency of waves.

Figure 1. Electromagnetic spectrum arranged in order of decreasing wavelength

As wavelength increases, the frequency decreases, and as wavelength decreases, the

frequency increases. When electromagnetic energy is released as the energy level increases,
the wavelength decreases and frequency increases. The different types of electromagnetic
radiation shown in the electromagnetic spectrum consists of radio waves, microwaves, infrared
waves, visible light, ultraviolet radiation, X-rays, and gamma rays.

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 Learning Activities

Activity 1: Fill Me In

Directions: Complete the sentence by choosing the correct word from the box below.

Accelerating 1._______ produce electromagnetic waves. These waves are combination

of electric and 2._______ fields. A changing magnetic field produces an 3._______ field and a
changing electric field produces a 4._______ field. As accelerated 5._______ produce an
electric field of a wave, the varying electric field produces the wave’s 6._______ field. Both
the 7._______ field and the 8._______ field oscillate 9._______ to each other and to the
direction of the 10._______ wave.

electrons magnetic electric perpendicular propagating

Activity 2: Let’s Know EM Better

Directions: Using the word bank below, label each part of the electromagnetic spectrum and
fill your answers in the blanks.

gamma ray X-ray ultraviolet visible light

infrared microwave radio wave

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 Activity 3: Electro-Fill

Directions: Describe the different forms of electromagnetic waves according to their energy
level, frequency, and wavelength by writing numbers 1 (lowest/shortest) to 7
(highest/longest).

Forms of
Energy Level Frequency Wavelength
Electromagnetic
(lowest to highest) (lowest to highest) (shortest to longest)
Waves
radio waves
microwaves
infrared light
visible light
UV rays
X-ray
gamma rays

Guide Questions:
1.Which forms of electromagnetic waves has the following:
lowest energy level? __________________
highest frequency? __________________
longest wavelength? __________________
2. How will you describe the relationship between the frequency and energy level of the
different forms of electromagnetic waves?
______________________________________________________________________
______________________________________________________________________
3. How about the wavelength and energy level of these electromagnetic waves?
______________________________________________________________________
______________________________________________________________________

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 Assessment

Directions: Encircle the letter that corresponds to the correct answer.

1. Which two waves lie at the ends of the visible spectrum?

A. infrared and ultraviolet rays
B. radio waves and microwaves
C. radio waves and X-rays
D. X-rays and gamma rays
2. Who discovered radio waves?
A. Albert Einstein C. James Clerk Maxwell
B. Heinrich Hertz D. Wilhelm Roentgen
3. Which of the following is not true of all electromagnetic waves?
A. They are transverse waves.
B. They cannot travel in a vacuum.
C. They are produced by accelerating charges.
D. They have magnetic as well as electric components.
4. Which does not belong to the group?
A. infrared waves C. sound waves
B. microwaves D. X-rays
5. What is common among electromagnetic waves?
A. energy C. speed in vacuum
B. frequency D. wavelength

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 Enrichment

Activity 4: Word Hunt

Directions: Search the words that are related to electromagnetic spectrum by drawing a line
to the word. Then, write the word in each number below.

E L E C T R I C F I E L D S Z X C V B
W D F S P E E D F G H J K L U R W N M

T Q E E F R I T E L O I V A R T L U I
G A C D V E U S E V A W O I D A R U C

B Z G C M A X W E L L S D F G T H J R
P X G G H J K I A E Q S G I C P O I O

L R O I N T A S F V Z X C E V B N U W

K R O E N T G E N U E S P K G H I Y A

M O O P H B A D I H A S U G A H L T V
G A M M A R A Y S D J S S D A S D R E

1. ___________________ 6. __________________
2. ___________________ 7. __________________
3. ___________________ 8. __________________
4. ___________________ 9. __________________
5. ___________________ 10. __________________

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 Answers Key

Answer Key:

Activity 1
1. Electrons 6.Magnetic
2. Magnetic 7. Electric
3. Electric 8. Magnetic
4. Magnetic 9.Perpendicular
5. Electrons 10. Propagating

Activity 2 Assessment:
1. A. infrared and UV rays
2. B. Heinrich Hertz
3. B. They cannot travel in a vacuum
4. C. soundwaves
5. C. speed in vacuum

Activity 3

Forms of
Energy Level Frequency Wavelength
Electromagnetic
(lowest to highest) (lowest to highest) (shortest to longest)
Waves
radio waves 1 1 7
microwaves 2 2 6
infrared light 3 3 5
visible light 4 4 4
UV rays 5 5 3
X-ray 6 6 2
gamma rays 7 7 1

Guide Questions:
1.radio waves; gamma rays; radio waves
2. When frequency increases, energy level also increases.
3. When wavelength is longest, energy level is highest.

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Enrichment

E L E C T R I C F I E L D S Z X C V B
W D F S P E E D F G H J K L U R W N M

T Q E E F R I T E L O I V A R T L U I
G A C D V E U S E V A W O I D A R U C

B Z G C M A X W E L L S D F G T H J R
P X G G H J K I A E Q S G I C P O I O

L R O I N T A S F V Z X C E V B N U W

K R O E N T G E N U E S P K G H I Y A

M O O P H B A D I H A S U G A H L T V
G A M M A R A Y S D J S S D A S D R E

References

 https://chem.libretexts.org/Bookshelves/Physical_and_Theoretical_Chemistry_Textbo
ok_Maps/Supplemental_Modules_(Physical_and_Theoretical_Chemistry)/Spectrosco
py/Fundamentals_of_Spectroscopy/Electromagnetic_Radiation#:~:text=The%20differ
ent%20types%20of%20electromagnetic,is%20the%20visible%20light%20spectrum.
 https://www.google.com/search?q=em+waves&tbm=isch&chips=q:em+waves,g_1:sp
ectrum:os9mu3OUrPo%3D&rlz=1C1CHBF_enPH887PH887&hl=en&ved=2ahUKE
wiF0rC28IjqAhVDeZQKHWJuAp4Q4lYoAHoECAEQFQ&biw=1519&bih=763#im
grc=9_nl60o-SHsRVM
 John Donnie A. Ramos, Exploring Life Through Science Series The New Grade 10
(Phoenix Publishing House) 90-93
 Department of Education Science Learners Material pages 142-148
 Meliza P. Valdoz Science Links Worktext for Scientific and Technological Literacy
(Rex Bookstore) 91-96

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