Question 1

Which experiment provided the first evidence for the existence of electrons as negatively charged particles?

Accepted Answer

Thomson’s cathode ray tube experiment

Question 2

A He-Ne laser emits light with a wavelength of 633 nm. What is the frequency ($$
u) of $$this light? (Speed of light $$c = 3.00 	imes 10^8$ m/s)

Accepted Answer

$$4.74 	imes 10$$^{14}$$ Hz

Question 3

Which property of electromagnetic waves determines the color of visible light?

Accepted Answer

Frequency

Question 4

What is the energy of a single photon with a wavelength of 400 nm? (Planck’s constant $$h = 6.626 	imes 10$$^{-34}$$ J·s, c = 3.00$$ 	imes $$10^8 m/s)$$

Accepted Answer

$$4.97 	imes 10$$^{-19}$$ J$

Question 5

Which phenomenon demonstrates the wave nature of light by producing a pattern of bright and dark bands?

Accepted Answer

Diffraction through a double slit

Question 6

According to Einstein’s explanation of the photoelectric effect, what must be true for electrons to be ejected from a metal surface?

Accepted Answer

The frequency of the light must be above a threshold value

Question 7

Calculate the wavelength ($$\lambda) of an FM $$radio station broadcasting at 101.1 MHz. ($$c = 3.00 	imes 10^8$ m/s)

Accepted Answer

$$2.97 m$$

Question 8

Which of the following best describes the quantization of energy as proposed by Planck and Einstein?

Accepted Answer

Energy is delivered in discrete packets called quanta or photons

Question 9

What is the wavelength of light emitted when a hydrogen electron transitions from $$n=4 to$$ $$n=2$$? ($$R = 1.097 	imes 10$$^{-2}$$ nm$$^{-1}$$)

Accepted Answer

$$486.17 nm$$

Question 10

Which experiment led to the discovery of the atomic nucleus?

Accepted Answer

Rutherford’s gold foil experiment

Question 11

Which equation correctly relates the energy of a photon to its frequency?

Accepted Answer

$$E = h 
u$$

Question 12

What is the principal quantum number ($$n) $$primarily associated with in the Bohr model of the atom?

Accepted Answer

The energy level of the electron

Question 13

Which of the following best explains why electrons do not spiral into the nucleus according to quantum theory?

Accepted Answer

Electrons occupy quantized energy levels and can only lose energy in discrete amounts

Question 14

Which property of a wave is directly related to its brightness in the context of visible light?

Accepted Answer

Amplitude

Question 15

A baseball has a mass of 149 g and is thrown at 100 mi/h. What is its de Broglie wavelength? ($$h = 6.626 	imes 10$$^{-34}$$ J·s, 1$ mi = 1.609$ km)

Accepted Answer

$$9.95 	imes 10$$^{-35}$$ m

Question 16

Which statement best describes the Heisenberg Uncertainty Principle?

Accepted Answer

The more precisely we know the position of a particle, the less precisely we can know its velocity

Question 17

Which of the following is a real-world application of the photoelectric effect?

Accepted Answer

Automatic door openers

Question 18

Which of the following best explains why different elements produce different colors in flame tests?

Accepted Answer

Each element has a unique set of quantized energy levels

Question 19

What is the relationship between wavelength ($$\lambda) $$and frequency ($$
u) $$for electromagnetic waves?

Accepted Answer

$$c = \lambda 
u$$

Question 20

Which of the following is NOT a consequence of the wave-particle duality of light?

Accepted Answer

Light can be described only as a wave

Periodicity and the Electronic Structure of Atoms: Waves, Light, and Quantum Theory

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