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Dual Nature of Light Answers

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Heinrich Hertz used properties of which type of wave to support the idea that light is also made of waves?

A
infrared
B
gamma
C
microwave
D
radio
2
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What is the formula for calculating the energy of a photon?

A
E = h – f
B
E =
Option B
C
E = h + f
D
E = hf
4

A photon has 3.4 × 10–18 joules of energy. Planck’s constant is 6.63 × 10–34 J•s.

A
5.12 × 10–15 Hz
B
1.95 × 1016 Hz
C
5.12 × 1015 Hz
D
1.95 × 10–16 Hz
5

Which statement best describes the ideas of two scientists who studied properties of light?

A
Newton and Maxwell had similar ideas about light being made of particles.
B
Hertz extended Maxwell’s idea that light is produced by the interaction of electric and magnetic fields.
C
Young supported Newton’s idea of the wave theory of light after observing light spread out in all directions.
D
Huygens agreed with Maxwell that light has properties of both particles and waves.
6

What is the energy of a photon with a frequency of 2.2 × 1016 Hz? Planck’s constant is 6.63 × 10–34 J•s.

A
1.5 × 10–17 J
B
8.8 × 10–17 J
C
1.5 × 10–16 J
D
8.8 × 10–16 J
7

Which phenomena support only the particle theory of light? Select 2 options.

A
reflection
B
bending around objects
C
traveling in a straight path
D
interference
E
photoelectric effect
8

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

A
Light is produced by the interaction of magnetic and electric fields.
B
Light spreads out after passing through an opening.
C
Light diffracts when it hits a barrier.
D
Light moves in a straight path.
9

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

A
The pattern was caused by light moving in a straight path.
B
The pattern was caused by light being separated into colors.
C
The pattern was caused by the interference of waves.
D
The pattern was caused by the reflection of waves.
10

Which phenomena support only the wave theory of light? Select 2 options.

A
reflection
B
refraction
C
diffraction
D
interference
E
photoelectric effect
11

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

A
a proton
B
an electron
C
a quantum
D
a wave
12

Which theory was contradicted by experiments with the photoelectric effect?

A
Light spreads out after it passes through a small opening.
B
As soon as light strikes metal, electrons will be ejected.
C
Visible light, regardless of color, will cause the ejection of electrons when striking metal.
D
The kinetic energy of ejected electrons depends on the frequency of light that strikes the metal.
13

The chart shows the frequencies of certain colors of visible light.

Question illustration
A
violet and green
B
red and orange
C
violet only
D
red, violet, green, and orange
14

Which describes a relationship when calculating the energy of a photon?

A
The energy of the photon is directly proportional to frequency.
B
The energy of the photon is inversely proportional to frequency.
C
As the energy of the photon increases, Planck’s constant increases.
D
As the energy of the photon increases, Planck’s constant decreases.

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