PHYSICS 101-What type of wave allows you to hear sounds

PHYSICS 101-What type of wave allows you to hear sounds

Subject: Physics    / General Physics
Question

What type of wave allows you to hear sounds?

a. mechanical transverse waves

b. mechanical longitudinal waves

c. electromanetic longitudinal waves

d. electromagnetic transverse waves

2. If the period of a wave is 20 s, then what is its frequency?

a. 2.0 Hz

b. 0.05 Hz

c. 10 Hz

d. 20 Hz

3. While watching a science fiction movie your friend comments that it would be cool to be in the battle in outer space and hear all the spaceships blowing up. You explain that the movie was wrong, and he asks why. What is your response?

a. Outer space is a vacuum and cannot transmit sound waves.

b. Sound travels too fast in outer space to be heard

c. Outer space is too cold to transmit sound waves.

d. Only the alien spaceships can make sounds because they follow different physics.

4. What causes the increase in pitch as an ambulance siren moves toward you?

a. The amplitude of the sound waves changes

b. The speed of the sound waves changes

c. The sound waves become compressed

d. The sound waves spread farther apart

5. Jim quadruples the distance between himself and a sound source. What is the change in decibels of the sound he hears?

a. +6 dB

b. -6 dB

c. +12 dB

d. -12 dB

6.Which seismic wave is a transverse wave?

a. T wave

b. Q wave

c. P wave

d. S wave

7. A set of water waves travels at 10 m/s, and 5.0 waves pass you in 2.0 s. What is the wavelength of the waves?

a. 0.25 m

b. 0.2 m

c. 4.0 m

d. 5.0 m

8.A copper rod at 25 degrees C is 1.5 m long. How long would it take a sound to move through the rod from one end to another?

CHART:

<M e d i u m> <m/s>

Air( 0 degrees C) 331

Air(20 degrees C) 343

Helium(0 degrees C) 972

Water(25 degrees C) 1493

Seawater(25 degrees C) 1533

Copper(25 degrees C) 3560

Iron 5130

a. 2.9 * 10^-4 s

b. 9.8 * 10^-4 s

c. 4.5 * 10^-3 s

d. 4.2 * 10^-4 s

9. A singer raises his pitch one octave. What quality of the sound wave has changed?

a. the frequency has increased.

b. The speed has increased.

c. The amplitude has increased

d. The wavelength has increased

10.Which of the following parts of a sound wave corresponds to a trough in transverse wave?

a. rarefaction

b. peak

c. equilibrium

d. compression