WorksheetsPhysical Science Q2 - Week 3
Total questions: 15
Worksheet time: 1hrs 11mins
Who proposed that light is composed of particles that are travelling in a straight line?
a. Christiaan Huygens
b. Louis de Broglie
c. Max Planck
d. Sir Isaac Newton
What evidence tells that light is made up of particles travelling in a straight line?
a. formation of shadows when light hits obstacles
b. inversion of images formed on plane mirrors
c. production of ripples when a penny is dropped to a pond
d. scattering of light rays when they reach a smooth surface
What is true of photoelectric effect?
a. Electrons from metals can be dislodged by photons from light.
b. The sun’s light rays travel in waves directly on the electrons of atoms.
c. It proves that light is made up of waves that can remove electrons from metals.
d. Light energy is composed of several colors with their respective amountsof energy.
How is the specific quantity of light that can be absorbed by electrons toproduce photoelectric effect called?
a. particle
b. photon
c. wave
d. wavelength
How are light waves or electromagnetic (EM) spectrum characterized?
a. The crests and amplitudes of the waves are vibrating.
b. It is composed of light waves with equal amounts of energy.
c. The wavelengths and frequencies are the same for all the waves.
d. It is composed of alternating magnetic and electric fields that oscillate perpendicular to each other
Why do most leaves appear green to our sight?
a. All the colours of white light are absorbed by the leaves
b. The colours of the light are scattered by the molecules of the green leaves.
c. Most of the colours of incident white light are reflected from the leaves except green.
d. The colours of white light are absorbed by the leaves and green waves are reflected.
What forms when light waves bounce off a mirrored surface?
a. image
b. particle
c. photon
d. shadow
Which of the following describes how Sir Isaac Newton viewed the nature of light?
a. Light is a wave.
b. Light is indivisible
c. Light is composed of particles.
d. Light is composed of white particles.
In what ways can light’s behaviour be described?
a. Curve and linear motions
b. Projectile motion
c. Waves and particles
d. Waves and shadows
What are knocked off when light photons strike metal surfaces?
a. Electrons
b. Neutrons
c. Positrons
d. Protons
What do light particles not able to exhibit as they move along obstacles or slits?
a. Diffraction
b. Doppler effect
c. Photoelectric effect
d. Refraction
Why is red colour always seen on top while blue is at the bottom of a rainbow?
a. Blue has a short wavelength so it moves faster and refracted the most by droplets of water in the atmosphere
b. Blue has a long wavelength so it moves faster and refracted the most by water droplets in the air.
c. Red has a short wavelength so it moves faster and refracted the least by droplets of water in the atmosphere.
d. Red has a long wavelength so it moves faster and refracted the least by water droplets in the air.
How do you see colors?
a. Wavelengths are reflected/ transmitted.
b. Wavelengths are absorbed.
Why is UV more damaging to our skin?
a. Ultraviolet (UV) light has shorter wavelength than visible light.
b. Ultraviolet (UV) light has longer wavelength than visible light.
What are used to quantify or measure the amount of the energy in light and other electromagnetic waves.
A. Neutrons
B. Positrons
C. Electrons
d. Photons
