Question

Question 1 (5 points)

What's the velocity of the sound wave at a temperature of 36°C?
Question 1 options:


A)
350.0 Hz


B)
352.6 Hz


C)
344.0 Hz


D)
335.6 Hz
Question 2 (5 points)

When a tuning fork vibrates over an open pipe and the air in the pipe starts to vibrate, the vibrations in the tube are caused by
Question 2 options:


A)
harmonics.


B)
beats.


C)
resonance.


D)
reinforcement.
Question 3 (5 points)

If two waves with equal amplitudes and wavelengths travel through a medium in such a way that a particular particle of the medium is at the crest of one wave and at the trough of the other wave at the same time, what will happen to that particle?
Question 3 options:


A)
The particle will remain stationary due to interference.


B)
The particle will vibrate with double amplitude due to resonance.


C)
The particle will move halfway to the crest due to reinforcement.


D)
The particle will cause beats as a result of the wave combination.
Question 4 (5 points)

If a light wave hits a smooth surface at an angle of incidence of 40 degrees, the angle of reflection is
Question 4 options:


A)
80 degrees.


B)
0 degrees.


C)
90 degrees.


D)
40 degrees.
Question 5 (5 points)

If you're standing directly _______ the sound source, the sound will reach each ear out of phase.
Question 5 options:


A)
to the right of


B)
below


C)
behind


D)
in front of
Question 6 (5 points)

If a sound is refracted away from the surface of the earth, this indicates that the
Question 6 options:


A)
ground is cooling faster than the air.


B)
air is cooler than the ground.


C)
air has high humidity.


D)
wind is blowing in the direction of the sound.
Question 7 (5 points)

Rarefaction occurs only in a _______ wave.
Question 7 options:


A)
transverse


B)
longitudinal


C)
forced


D)
sympathetic
Question 8 (5 points)

The longest wavelength within the visible spectrum is _______ light.
Question 8 options:


A)
violet


B)
red


C)
orange


D)
blue
Question 9 (5 points)

If you were trying to build a soundproof room, which of the following materials would you choose to absorb the most sound, based on the coefficient of absorption for each material?
Question 9 options:


A)
Carpet


B)
Heavy curtains


C)
Wood


D)
Clay tile
Question 10 (5 points)

Someone standing in front of a smooth surface from which a sound is reflected may hear
Question 10 options:


A)
reflected waves with a smaller wavelength and higher intensity than the original sound.


B)
reflected waves of the exact same intensity as the original sound source.


C)
reflected waves of a different wavelength from the original sound source.


D)
reflected waves of the same wavelength and less intensity than the original sound source.
Question 11 (5 points)

Which of the following statements is true of vibrations?
Question 11 options:


A)
Infrasonic vibrations are used in sonar equipment and to detect flaws in steel castings.


B)
Neither ultrasonic nor infrasonic vibrations can be heard by humans.


C)
Ultrasonic vibrations have a frequency lower than the range for normal hearing.


D)
The frequency of infrasonic vibrations is much too high to be heard by humans.
Question 12 (5 points)

The term "angle of deviation" is used in reference to a/an
Question 12 options:


A)
analyzer.


B)
prism.


C)
lens.


D)
polarizer.

Answer 1

1. B — 352.6 m/s (v = 331 + 0.6T → 331 + 0.6·36 = 352.6)

2. C — resonance.

3. A — The particle will remain stationary (destructive interference: crest + trough cancel).

4. D — 40 degrees (angle of reflection equals angle of incidence).

5. A — to the right of (being directly to one side produces a path difference so the ears can receive sound out of phase).

6. A — ground is cooling faster than the air (warmer air above cooler ground causes sound to refract away from the surface).

7. B — longitudinal.

8. B — red.

9. A — Carpet (best absorber among the choices).

10. D — reflected waves of the same wavelength and less intensity than the original sound.

11. B — Neither ultrasonic nor infrasonic vibrations can be heard by humans.

12. B — prism.