Chapter 26: Properties Of Light

45 Questions | By Drtaylor | Updated: Mar 22, 2022 | Attempts: 1398

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1.

Most of the waves in the electromagnetic spectrum are
- A.
  
  Red light.
- B.
  
  Blue light.
- C.
  
  Green light.
- D.
  
  Invisible.
2.

Electromagnetic waves consist of
- A.
  
  Compressions and rarefactions of electromagnetic pulses.
- B.
  
  Oscillating electric and magnetic fields.
- C.
  
  Particles of light energy.
- D.
  
  High-frequency gravitational waves.
3.

The fact that light travels at 300,000 km/s is a consequence of
- A.
  
  Electromagnetic wave propagation.
- B.
  
  Electromagnetic field induction.
- C.
  
  Maxwell's laws.
- D.
  
  Energy conservation.
- E.
  
  None of these
4.

The source of all electromagnetic waves is
- A.
  
  Changes in atomic energy levels.
- B.
  
  Vibrating atoms.
- C.
  
  Accelerating electric charges.
- D.
  
  Crystalline fluctuations.
- E.
  
  None of these
5.

The main difference between a radio wave and a light wave is its
- A.
  
  Speed.
- B.
  
  Wavelength.
- C.
  
  Frequency.
- D.
  
  All of these
- E.
  
  Two of these
6.

Which of these electromagnetic waves has the shortest wavelength?
- A.
  
  Radio waves
- B.
  
  Infrared waves
- C.
  
  X-rays
- D.
  
  Ultraviolet waves
- E.
  
  Light waves
7.

Compared to ultraviolet waves, the wavelength of infrared waves is
- A.
  
  Shorter.
- B.
  
  Longer.
- C.
  
  The same.
8.

Compared to radio waves, the velocity of visible light waves in a vacuum is
- A.
  
  Less.
- B.
  
  More.
- C.
  
  The same.
9.

If an electric charge is shaken up and down
- A.
  
  Sound is emitted.
- B.
  
  Light is emitted.
- C.
  
  Electron excitation occurs.
- D.
  
  A magnetic field is created
- E.
  
  Its mass decreases.
10.

If an electron vibrates up and down 1000 times each second, it generates an electromagnetic wave having a
- A.
  
  Period of 1000 s.
- B.
  
  Speed of 1000 m/s.
- C.
  
  Wavelength of 1000 m.
- D.
  
  Frequency of 1000 Hz.
- E.
  
  Wavelength of 1000 km.
11.

Which of the following is fundamentally different from the others?
- A.
  
  Sound waves
- B.
  
  X-rays
- C.
  
  Gamma rays
- D.
  
  Light waves
- E.
  
  Radio waves
12.

The natural frequency of the atoms in glass is in the
- A.
  
  Infrared part of the spectrum.
- B.
  
  Visible part of the spectrum.
- C.
  
  Ultraviolet part of the spectrum.
13.

When ultraviolet light is incident upon glass, atoms in the glass
- A.
  
  Are forced into vibration.
- B.
  
  Resonate.
- C.
  
  Pass the light energy along practically undiminished.
- D.
  
  Freely absorb and re-emit most of the ultraviolet light.
14.

When visible light is incident upon clear glass, atoms in the glass
- A.
  
  Are forced into vibration.
- B.
  
  Resonate.
- C.
  
  Convert the light energy into internal energy.
15.

Consider light energy that is momentarily absorbed in glass and then re-emitted. Compared to the absorbed light, the frequency of the re-emitted light is
- A.
  
  Considerably less.
- B.
  
  Slightly less.
- C.
  
  The same.
- D.
  
  Slightly more.
- E.
  
  Considerably more.
16.

The speed of light in the void between molecules in glass is
- A.
  
  More than its speed in a vacuum.
- B.
  
  The same as its speed in a vacuum.
- C.
  
  Less than its speed in a vacuum.
17.

Compared to its average speed in air, the average speed of a beam of light in glass is
- A.
  
  More.
- B.
  
  Less.
- C.
  
  The same.
18.

Infrared waves are often called heat waves because they
- A.
  
  Emanate from relatively hot sources.
- B.
  
  Consist of frequencies lower than those of visible light.
- C.
  
  Induce resonance in molecules and increase internal energy in a substance.
- D.
  
  Are absorbed rather than reflected by the skin.
- E.
  
  Are the predominant waves emitted by the sun.
19.

Materials generally become warmer when light is
- A.
  
  Absorbed by them.
- B.
  
  Reflected by them.
- C.
  
  Transmitted by them.
- D.
  
  All of these
- E.
  
  None of these
20.

Sunburns are produced by
- A.
  
  Ultraviolet light.
- B.
  
  Visible light.
- C.
  
  Infrared light.
- D.
  
  All of these
- E.
  
  None of these
21.

The Earth's atmosphere is transparent to most waves in the
- A.
  
  Infrared part of the spectrum.
- B.
  
  Visible part of the spectrum.
- C.
  
  Ultraviolet part of the spectrum.
- D.
  
  Entire electromagnetic spectrum.
22.

A lunar eclipse occurs when the
- A.
  
  Sun passes into Earth's shadow.
- B.
  
  Moon passes into Earth's shadow.
- C.
  
  Earth passes into the sun's shadow.
- D.
  
  Earth passes into the moon's shadow.
23.

A solar eclipse occurs when the
- A.
  
  Sun passes into Earth's shadow.
- B.
  
  Moon passes into the Earth's shadow.
- C.
  
  The moon's shadow touches Earth.
24.

A partial solar eclipse occurs for people in the sun's
- A.
  
  Umbra.
- B.
  
  Penumbra.
- C.
  
  None of these
25.

While Earth is experiencing a total solar eclipse, an observer on the side of the moon facing the Earth would see
- A.
  
  Earth disappear from the sky.
- B.
  
  Earth dim and turn reddish.
- C.
  
  Nothing unusual.
- D.
  
  A tiny dark spot move across the face of Earth.