This document contains a learning activity worksheet on light, reflection, refraction, and how electrons behave as waves. It includes multiple choice questions, fill-in-the-blank activities, and short answer questions to test students' understanding of key concepts. Students are asked to define terms, describe phenomena like the photoelectric effect, and explain how experiments provide evidence that electrons exhibit wave-like properties. The various activities assess students' knowledge of the wave and particle nature of light and electrons.

1. Republic of the Philippines
Department of Education
National Capital Region
Schools Division Office of Las
PiñasCity
Learning Activity Worksheets (LAW)
Physical Science
Grade 12
Name: _ Date: _ Rating/Score _
LIGHT, REFLECTION, AND REFRACTION
Activity 1: Think and pair!
Direction: Match column A with the correct answer on column B, write only the letter of
answer on the space provided.
B 1. The return of light or sound waves from a surface A. translucent
D 2. Does not allow light to pass through all light B. reflection
is either absorbed or reflected.
F 3. It travels in a straight line unless something C. refraction
gets in the way.
E 4. Allows almost all light to go through, so can be D. opaque
seen through clearly.
C 5. Bending of a wave when it enters a E. transparent
medium where its speed is different.
A 6. Can be seen through, but not clearly. Allows some F. light
light to go through, but some are also absorbed or reflected.
Activity 2: Guess the picture!
Direction: Examine the picture, choose the correct answer from the box and write it on
the space provided.
Specular Reflection 1. Light 2. Reflection3.
Absorption
4.
Refraction 5. Diffuse Reflection6.
https://www.pinterest.ph/pin/399976010638919953/
Q2 Week 3 (Learning Activity Worksheet) Page 1 of 8
Target Competency: Describe how the propagation of light, reflection, and refraction are
explained by the wave model and the particle model of light. (S11/12PS-IVf-59)

2. Activity 3: Select all that apply!
Direction: Tick the box. There is more than one correct answer for each category. All of
the following are examples of the given category except:
Category Objects
Absorb
Reflect
Refract
https://www.pinterest.ph/pin/399976010638919953/
How does the light behave for each category?
Light behaves in a way that is consistent with our conceptual and mathematical
understanding of waves. Since light behaves like a wave, one would have good
reason to believe that it might be a wave.
Activity 4: Think and write!
In this activity you need the following materials:
Flashlight, Colored Paper, and rubber band
Direction: Wrap the paper around the flashlight and tie it with a rubber band.
Answer the following questions:
1. What happens if we cover the flashlight with paper? Will the light pass through the
paper?
If you tried to shine a flashlight through a sheet of black construction paper, it would block
the light. Light would not be able to pass through to the other side, and it would not be
reflected. Something dark in color and also a thicker material like construction paper would
block light from passing.
2. Will the light change colors or stay the same?
The wavelength changes because the speed of light changes and the ratio of these
remains constant which is the frequency of the light wave. Color is a direct result of the
frequency of a wave, not it's wavelength. Wavelength is merely the distance between two
consecutive crests/troughs of a wave.
Q2 Week 3 (Learning Activity Worksheet) Page 2 of 8
Target Competency: Describe how the propagation of light, reflection, and refraction are
explained by the wave model and the particle model of light. (S11/12PS-IVf-59)
reflection
specular reflection
diffuse reflection
absorption
refraction
light

3. Activity 5: ANSWER ME!
Direction: Answer the question in 5-10 sentences.
How do the wave model and particle model of light explain the behavior of light?
Both the particle and wave theories adequately explain reflectionfrom a smooth
surface. However, the particle theory also suggests that if the surface is very
rough, the particles bounce away at a variety of angles, scattering the light. This
theory fits very closelyto experimental observation. The particle model of light
predicted that the speed oflight would be faster in water than in air, and the
wave modelpredicted the opposite. Therefore,the determination of the speed
of light was seento be a critical experimentin order to decide betweenthe wave
and particle models of light. Light behaves mainly like a wave but it can also be
considered to consistof tiny packages of energy called photons.
Activity 6: Multiple Choice
Direction: Circle the letter of the correct answer.
1. What do you call the nerves in the eyes that carry signals to the brain?
A. auditory nerve C. optic nerve
B. sensory nerve D. olfactory nerve
2. What separates twelve visible colors from each color found in the light?
A. spectrum C. wavelength
B. rainbow D. prism
3. What are the two types of photoreceptors?
A. rods and cones C. rods and retina
B. optic and cones D. pupil and iris
4. How does the human eye work?
A. Brain receptors within the eye transmit messages to the rods, which produces
the familiar sensations of color.
B. Light receptors within the eye transmit messages to the brain, which produces
the familiar sensations of color.
C.Light within the eye transmit messages to the brain, which produces the rods
and cones.
D. Spectrum receptors within the eye transmit messages to the rods and cones,
which produces the familiar sensations of color.
Q2 Week 3 (Learning Activity Worksheet) Page 3 of 8
TargetCompetency:Describehow the propagation of light, reflection, and refraction are explained
by the wave model and the particle model of light. (S11/12PS-IVf-59)

4. 5. Why do we get sunburned in ultraviolet light rather than in visible light?
A. UV light has a lower frequency than visible light
B. UV is insufficiently energetic to cause skin damage
C. visible light has a higher frequency than UV light
D. ultraviolet light is of higher frequency than visible light
6. Why is red light used in photographic dark rooms?
A. red light is very low in frequency
B. red light is very high in frequency
C. red light has no frequency
D. no reason at all
Activity 7:
Directions: Answer the question.
Describe “photon” in 3-5 sentences.
A photon is a tiny particle that comprises waves of electromagnetic radiation. Photons have
no charge, no resting mass, and travel at the speed of light. Photons are emitted by the
action of charged particles, although they can be emitted by other methods including
radioactive decay.
Q2 Week 3 (Learning Activity Worksheet) Page 4 of 8
Target Competency: Explain how the photon concept and the fact that the energy of a photon is
directly proportional to its frequency can be used to explain why red light is used in photographic
dark rooms,why we get easily sunburned in ultraviolet light but not in visible light, and how we see
colors (S11/12PS-IVf-61)

5. ELECTRONS BEHAVE LIKE WAVES
Activity 1: CRACK ME!
Directions: Unscramble the letters below to reveal the correct word given its definition.
1. SEONLCTRE ELECTRONS
Negatively charge subatomic particles.
2. TREICTOHPOELC ECTFEF PHOTOELECTRIC EFFECT
The emission of electrons from a metal plate when light hits on it.
3. ELNIS HBOR NIELS BOHR
He proposed the description of the structure of the atom.
4. PONTCMO FECFET COMPTON EFFECT
It is the result of a high-energy photon colliding with a target which releases loosely
bound electrons.
5. TINGRETACS RETRACTING
Light is absorbed and reradiated by particles in the air; it is the change of motion
of a particle due to its collision with another particle.
6. NISDERPIOS DISERSION
When light passes through a medium such as a glass prism, it separates into
different colors.
7. MTOHAS OUYNG THOMAS YOUNG
English physician who established the principle of interference of light.
8. RAFCFIDNIOT DIFFRACTION
It is the bending of waves as it passes through an obstacle or barrier.
9. RFEINETNECEN INTERFERENCE
It is the net effect of the combination of two wave trains that are overlapping each
other.
10. VAWE WAVE
It is a disturbance that transfers energy from one place to another.
Q2 Week 4 (Learning Activity Worksheet) Page 5 of 8
Target Competency:
 Cite experimental evidence showing that electrons behave like waves (S11/12PS-IVg-
64)
 Differentiate dispersion, scattering, interference, and diffraction (S11/12PS-IVg-65)

6. Activity 2: COMPLETE ME!
Direction: Complete the sentences below by writing the missing word in each number.
Choose the word that best fits the statement below. Write your answer on the space
provided.
1. Electrons, protons, and neutrons are the SUBATOMIC PARTICLES that
composes an atom.
2. Exhibiting INTERFERENCE effects is oneof the ESSENTIAL characteristics ofwaves.
3. De Broglie showed that in a the wave properties of electrons are dominant.
4. In photoelectric experiments, kinetic are ejected with a certain maximum
photoelectrons energy that increases in proportion to the light wave frequency.
5. Compton scattering experiment shows the wave characteristics of electrons.
Activity 3: POSITIVE OR NEGATIVE
Direction: Write P if the statement is correct and N if the statement is wrong. Write your
answer on the space provided before the number.
P 1. Electrons, protons, and neutrons are subatomic particles that compose an atom.
P 2. Compton scattering experiment showed that wave properties of electrons are
dominant.
P 3. Exhibiting interference effects is one of the essential characteristics of waves.
P 4. De Broglie showed the wave characteristics of electrons.
N 5. In photoelectric experiments, the electrons that are being ejected from the metal are
called photoelectrons.
N 6. Protons and neutrons are found inside the nucleus of an atom.
N 7. Electrons rotate in orbits of different energy levels forming a cloud around the
nucleus.
P 8. Electrons are found inside the nucleus.
P 9. Many experimental shreds of evidence show that electrons behave like waves.
N 10. No recent discoveries reveal that electrons can behave like waves.
N 11. According to Thomas Young, light exhibits interference effects in his double-slit
experiment.
P 12. When light passes through a medium such as a glass prism it does not separate.
N 13. Diffraction is the bending of light as it passes through a small opening of the
edges of barriers.
P 14. When polarized sunlight strikes a molecule, electrons accelerate and vibrate
vertically and horizontally then reradiate as polarized light.
N 15. Dispersion is the separation of visible light into its different colors.
Q2 Week 4 (Learning Activity Worksheet) Page 6 of 8
Target Competency: Cite experimental evidence showing that electrons behave like waves
(S11/12PS-IVg-64)
Differentiate dispersion, scattering, interference, and diffraction (S11/12PS-IVg-65)
a. Compton e. photoelectrons
b. subatomic particles f. essential
c. kinetic g. Bohr atom
d. interference h. wave

7. Activity 4: TIME TO PONDER!
Direction: Given the real-life situation, explain the following pictures in 2-3 sentences
using the essential words or key terms on dispersion, scattering, interference, and
diffraction.
1. Explain why the color of the seawater is blue?
The ocean is blue because w ater absorbs colorsin the red part of the light spectrum. ... The ocean may
also take on green, red, or other hues as light bounces off of floating sediments and particles in the w ater.
Most of the ocean, how ever, is completely dark.
https://www.google.com/search?q=picture+of+why+does+the+color+of+the+ocean+blue&tbm
2. Why do you think the light bends at the
corner of the door?
Light is alw ayswaving against itself, leading to internal interference of the different wave
components in w hat w e call internaldiffraction. This diffraction causes a beamof light to slow ly
spread out as it travels, so that some of the light bends aw ay fromthe straight line motion of the
main part of the w ave.
https://www.google.com/search?q=picture+of+bending+of+light+at+corner+of+the+door&tbm
3. Explain why the path of light can be seen
when dust particles are spread in cinema
theaters or smart rooms?
This happens due to the scattering phenomenon of light by dust particles. Light travels in a
straight line path. Then the path of light is deviated from its straight line path and, as a result of
this the dust particles become visible.
https://www.google.com/search?q=picture+of+dark+room+cinema&tbm
4. What causes the rainbow to form?
A rainbow is caused by sunlight and atmospheric conditions. Light enters a w ater droplet,
slow ing down and bending as it goes from air to denser w ater. The light reflects off the inside
of the droplet, separating into its component w avelengths--or colors. When light exits the
droplet, it makes a rainbow .
https://www.google.com/search?q=picture+of +rainbow&tbm
Q2 Week 4 (Learning Activity Worksheet) Page7 of 8
Target Competency: Cite experimental evidence showing that electrons behave like waves
(S11/12PS-IVg-64)
Differentiate dispersion, scattering, interference, and diffraction (S11/12PS-IVg-65)

8. Activity 5: MULTIPLE CHOICE
Direction: Choose the letter of the best answer. Circle the letter of the correct
answer.
1. What does the dispersion of light show when it passes through a prism?
A. the prism contains many narrow, equally spaced slits
B. all wavelengths have the same speed in a material
C. different wavelengths have different speeds in the material
D. the index of refraction is the same for all wavelengths
2. Which one does not show a difference between the wave theory and particle theory
of light?
A. reflection C. interference
B. refraction D. diffraction
3. Holograms can be viewed with?
A. light from a laser C. a spotlight
B. sunlight D. all of the above
4. Which property of light allows a rainbow to form?
A. refraction C. diffraction
B. polarization D. interference
5. What property of light is responsible for alternating light and dark bands when light
passes through two or more slits?
A. refraction C. polarization
B. diffraction D. interference
6. What property of light is responsible for light spreading as it passes through a
narrow slit?
A. refraction C. diffraction
B. interference D. reflection
7. Which of the following refers to the separation of white light into its component
colors when it is refracted?
A. diffraction C. dispersion
B. interference D. scattering
8. Which of the following phenomena can diffraction of light be observed?
A. Soap bubbles C. oil slick
B. rainbows D. all of the above
9. Which of the following best explains why the sky is blue?
I. The atmosphere is composed of tiny particles that scatter components of
lights with shorter wavelengths
II. Blue is a component of light that has a long wavelength and is scattered
easily by the particles of the atmosphere.
III. Blue is a component of light that has a short wavelength and is scattered
easily by the particles of the atmosphere.
IV. The atmosphere is composed of tiny particles that scatter components of
light with longer wavelengths.
A. I and II
B. I and III
C. II and IV
D. III and IV
10. Where does light travel fastest?
A. Air C. vacuum
B. Glass D. prism
Q2 Week 4 (Learning Activity Worksheet) Page 8 of 8
Target Competency: Cite experimental evidence showing that electrons behave like waves
(S11/12PS-IVg-64)
Differentiate dispersion, scattering, interference, and diffraction (S11/12PS-IVg-65)