It is always $$3.00 \times 10^8$ m/s.

Question 1

Which statement best describes the quantum-mechanical model of the atom?

Accepted Answer

It explains the manner in which electrons exist and behave in atoms.

Question 2

Which property of light determines its color?

Accepted Answer

Wavelength ($$\lambda)$$

Question 3

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

Accepted Answer

They are inversely proportional.

Question 4

Which equation correctly relates the speed of light ($$c$$), wavelength ($$\lambda$$), and frequency ($$v$$)?

Accepted Answer

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

Question 5

A radar system uses a frequency of 435 MHz. What is the wavelength of this electromagnetic wave? ($$c = 3.00 	imes 10^8$ m/s)

Accepted Answer

$$0.69 m$$

Question 6

Which of the following best explains why you see fireworks before you hear them?

Accepted Answer

Light travels faster than sound.

Question 7

Which property of a wave is a measure of its intensity?

Accepted Answer

Amplitude

Question 8

Which statement about the electromagnetic spectrum is correct?

Accepted Answer

Visible light comprises only a small fraction of the electromagnetic spectrum.

Question 9

If a green laser and a dim red laser emit light of the same amplitude, which property differs between them?

Accepted Answer

Frequency

Question 10

Which of the following is a consequence of the wave-particle duality of light?

Accepted Answer

Light can behave both as a wave and as a particle.

Question 11

A radio station broadcasts at 98.5 MHz. What is the wavelength of the broadcast signal? ($$c = 3.00 	imes 10^8$ m/s)

Accepted Answer

$$3.05 m$$

Question 12

Which of the following electromagnetic waves has the highest energy?

Accepted Answer

Gamma rays

Question 13

What is the unit of frequency?

Accepted Answer

Hertz ($$	ext{Hz})$$

Question 14

Which statement best describes the color of an object?

Accepted Answer

It is determined by the wavelengths of light reflected by the object.

Question 15

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

Accepted Answer

They require a medium to travel.

Question 16

If the frequency of an electromagnetic wave increases, what happens to its wavelength?

Accepted Answer

It decreases.

Question 17

Which of the following best describes the amplitude of a wave?

Accepted Answer

The height from node to crest or node to trough.

Question 18

Which real-world application relies on the properties of electromagnetic waves for long-range surveillance?

Accepted Answer

Radar systems

Question 19

Which of the following is true about the speed of electromagnetic waves in a vacuum?

Accepted Answer

It is always $$3.00 	imes 10^8$ m/s.

Question 20

Which property of electromagnetic radiation allows it to potentially damage biological molecules?

Accepted Answer

High energy

The Quantum-Mechanical Model of the Atom

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