Quiz about Chemistry Honors Review - Properties of Electrons

Question 1

Which of the following correctly describes the relationship between wavelength and frequency for electromagnetic waves?

Accepted Answer

As wavelength increases, frequency decreases.

Answer

As wavelength increases, frequency increases.

Answer

Wavelength and frequency are not related.

Answer

As frequency increases, wavelength remains constant.

Question 2

Which region of the electromagnetic spectrum has the highest energy photons?

Accepted Answer

Gamma rays

Answer

Radio waves

Answer

Infrared

Answer

Ultraviolet

Question 3

What is the speed of all electromagnetic waves in a vacuum?

Accepted Answer

$$3.00 imes 10^8$$ m/s

Answer

$$1.50 imes 10^8$$ m/s

Answer

$$3.00 imes 10^6$$ m/s

Answer

$$1.50 imes 10^6$$ m/s

Question 4

Which of the following best explains the photoelectric effect?

Accepted Answer

Electrons are emitted from a metal surface when light of sufficient frequency shines on it.

Answer

Electrons are emitted from a metal surface when it is heated.

Answer

Protons are emitted from a metal surface when light shines on it.

Answer

Neutrons are emitted from a metal surface when it is cooled.

Question 5

Which color of visible light has the shortest wavelength?

Accepted Answer

Violet

Answer

Red

Answer

Green

Answer

Blue

Question 6

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

Accepted Answer

$$E = hf$$

Answer

$$E = mc^2$$

Answer

$$E = \frac{1}{2}mv^2$$

Answer

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

Question 7

Which of the following statements is true about photon emission in atoms?

Accepted Answer

Photons are emitted when electrons move to lower energy levels.

Answer

Photons are emitted when electrons move to higher energy levels.

Answer

Photons are emitted only when atoms are ionized.

Answer

Photons are emitted when protons move between energy levels.

Question 8

Which of the following electromagnetic waves has the longest wavelength?

Accepted Answer

Radio waves

Answer

X-rays

Answer

Ultraviolet

Answer

Visible light

Question 9

An electron in a hydrogen atom drops from the $$n=3$$ to the $$n=2$$ energy level. Which of the following best describes the photon emitted?

Accepted Answer

It has less energy than a photon emitted from $$n=2$$ to $$n=1$$ .

Answer

It has more energy than a photon emitted from $$n=2$$ to $$n=1$$ .

Answer

It has the same energy as a photon emitted from $$n=2$$ to $$n=1$$ .

Answer

No photon is emitted.

Question 10

A wave has a wavelength of $$4.0 imes 10^{-7}$$ m. What is its frequency? (Speed of light $$c = 3.00 imes 10^8$$ m/s)

Accepted Answer

$$7.5 imes 10^{14}$$ Hz

Answer

$$1.2 imes 10^{15}$$ Hz

Answer

$$1.2 imes 10^{12}$$ Hz

Answer

$$7.5 imes 10^{10}$$ Hz

Question 11

A student observes that increasing the intensity of red light does not cause electrons to be emitted from a metal, but using blue light does. What conclusion can be drawn?

Accepted Answer

The energy of red light photons is less than the work function of the metal.

Answer

The energy of red light photons is greater than the work function of the metal.

Answer

The intensity of light is the only factor in electron emission.

Answer

The metal does not have a work function.

Question 12

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

Accepted Answer

The wavelength is halved.

Answer

The wavelength is doubled.

Answer

The wavelength remains the same.

Answer

The wavelength is quadrupled.

Question 13

Which of the following best explains why ultraviolet light can cause sunburn but visible light cannot?

Accepted Answer

Ultraviolet light has a shorter wavelength and higher energy than visible light.

Answer

Ultraviolet light has a longer wavelength and lower energy than visible light.

Answer

Visible light has higher energy than ultraviolet light.

Answer

Visible light has a shorter wavelength than ultraviolet light.

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