Question 1

Which statement best describes the wave-particle duality of light?

Accepted Answer

Light exhibits both wave-like and particle-like properties depending on the experiment.

Question 2

A laser emits light with a wavelength of 532 nm. What is the frequency of this light? Use $$c = 2.998 	imes 10^8$ m/s.

Accepted Answer

$$5.63 	imes 10$$^{14}$$ Hz

Question 3

Which equation correctly relates the speed of light, wavelength, and frequency?

Accepted Answer

$$c = \lambda 
u$$

Question 4

If the frequency of light is doubled, what happens to its wavelength (assuming the speed of light is constant)?

Accepted Answer

The wavelength is halved.

Question 5

Which of the following best describes the relationship between energy and frequency for a photon?

Accepted Answer

Energy is directly proportional to frequency.

Question 6

Calculate the energy of a photon with a frequency of $$4.24 	imes 10$$^{14}$$ Hz. Use h = 6.626$$ 	imes $$10^{-34} J$$·s.

Accepted Answer

$$2.81 	imes 10$$^{-19}$$ J

Question 7

Which property of electromagnetic waves determines their color in the visible spectrum?

Accepted Answer

Wavelength

Question 8

A photon has a wavelength of 157 nm. What is its frequency? Use $$c = 2.998 	imes 10^8$ m/s.

Accepted Answer

$$1.91 	imes 10$$^{15}$$ Hz

Question 9

Which of the following is NOT a characteristic property of electromagnetic waves?

Accepted Answer

Mass

Question 10

The energy of a photon is given by $$E = h 
u. If $$the frequency of a photon is $$3.00 	imes 10$$^{15}$$ Hz, what is its energy? Use h = 6.626$$ 	imes $$10^{-34} J$$·s.

Accepted Answer

$$1.99 	imes 10$$^{-18}$$ J

Question 11

Which of the following best explains why ultraviolet light is more dangerous to humans than visible light?

Accepted Answer

Ultraviolet light has a higher frequency and therefore higher energy per photon.

Question 12

A green laser pointer emits light at a wavelength of 542 nm. What is the energy of a single photon emitted? Use $$h = 6.626 	imes 10$$^{-34}$$ J·s and c = 2.998$$ 	imes $$10^8 m/s.$$

Accepted Answer

$$3.67 	imes 10$$^{-19}$$ J

Question 13

Which of the following changes would increase the energy of a photon?

Accepted Answer

Increasing its frequency

Question 14

Which equation would you use to calculate the wavelength of light if you know its frequency?

Accepted Answer

$$\lambda = \frac{c}{
u}$$

Question 15

Which of the following best describes amplitude in the context of electromagnetic waves?

Accepted Answer

The height of the wave crest or depth of the trough

Question 16

A hospital uses ultraviolet light to sterilize equipment. Which property of UV light makes it effective for this purpose?

Accepted Answer

High energy per photon due to short wavelength

Question 17

Which of the following is the correct value for the speed of light in a vacuum?

Accepted Answer

$$2.998 	imes 10^8$ m/s

Question 18

Which of the following is a consequence of the photoelectric effect?

Accepted Answer

Electrons are ejected from a metal surface when exposed to light of sufficient frequency.

Question 19

A scientist observes that increasing the intensity of red light does not cause electrons to be ejected from a metal surface, but increasing the frequency does. What does this observation support?

Accepted Answer

The energy of photons depends on their frequency, not their intensity.

The Nature of Light: Wave-Particle Duality and Electromagnetic Radiation

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