AnswersPhysicsDual Nature of Light

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What is the formula for calculating the energy of a photon?

A
cap e is equal to h f
B
cap e is equal to h minus f
C
cap e is equal to h plus f
D
cap e is equal to h over f
2
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Which theory was contradicted by experiments with the photoelectric effect?

A
Visible light, regardless of color, will cause the ejection of electrons when striking metal.
B
As soon as light strikes metal, electrons will be ejected.
C
Light spreads out after it passes through a small opening.
D
The kinetic energy of ejected electrons depends on the frequency of light that strikes the metal.
4

As part of the photoelectric effect, which of these is responsible for the pixels in an image on a digital camera?

A
accumulated electrons that are ejected by the image sensor
B
accumulated photons that are ejected by the image sensor
C
accumulated electrons that are absorbed by the image sensor
D
accumulated photons that are absorbed by the image sensor
5

Which observation supports the idea that light is made of particles?

A
Light spreads out after passing through an opening.
B
Light moves in a straight path.
C
Light is produced by the interaction of magnetic and electric fields.
D
Light diffracts when it hits a barrier.
6

Which best explains how the diffraction pattern observed in Young’s experiment supports the wave theory of light?

A
The pattern was caused by the reflection of waves.
B
The pattern was caused by light being separated into colors.
C
The pattern was caused by light moving in a straight path.
D
The pattern was caused by the interference of waves.
7

How does refraction support the particle theory of light?

A
Light slows down and bends when it moves from a less dense to a more dense medium.
B
Forces act on the particles to push or pull them from one medium to another.
C
As light passes through an opening, it spreads out in all directions.
D
Particles bounce off surfaces similar to the way in which a ball bounces off a wall.
8

What is the smallest packet of electromagnetic energy that can be absorbed or emitted?

A
a wave
B
a photon
C
an electron
D
a proton
10

Which phenomena support only the wave theory of light? Choose two correct answers.

A
interference
B
diffraction
C
photoelectric effect
D
refraction
E
reflection

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