Random final review CP

The source of every sound is something that is

• vibrating.
• moving.
• accelerating.
  
• undergoing simple harmonic motion.

Double the frequency of a sound and you halve its

• wavelength
• speed.
  
• amplitude.
  
• all of these

The approximate range of human hearing is

• 10 hertz to 10,000 hertz.
• 20 hertz to 20,000 hertz.
• 40 hertz to 40,000 hertz.
• Actually all of these – depends on the hearing ability of the person.
  

Compressions and rarefactions normally travel in

• the same direction in a wave.
• opposite directions in a wave.
• directions that are at right angles to the wave direction.

Sound travels faster in

• air.
• water.
• steel.
• a vacuum.

A wave having a frequency of 1000 hertz vibrates at

• less than 1000 cycles per second.
• 1000 cycles per second.
• more than 1000 cycles per second.

Refraction of sound can occur in

• air.
• water.
• both air and water.
• neither air nor water.

When the speed of sound near the ground is greater than it is at higher altitudes, the sound tends to be bent

• upward.
• downward.
• to the left
• to the right.

In perceiving its environment, a dolphin makes use of

• echoes
• the Doppler effect.
• ultrasound.
• All of the above choices are correct.

The wavelengths of sound that carry farther in air are relatively

• long.
• short.
• ultrasonic.