PhysicsLAB CP Workbook
Sound
Two major classes of waves are longitudinal and transverse. Sound waves are
 
The frequency of a sound signal refers to how frequently the vibrations occur. A high-frequency sound is heard at a high
 
The sketch below shows a snap shot of the compressions and rarefactions of the air in a tube as the sound moves toward the right. The dots represent molecules.

 
 
 
Using the ruler provided, the wavelength of the sound wave is measured to be 

Compared to the wavelengths of high-pitched sounds, the wavelengths of low-pitched sounds are
 
Sound waves travel fastest in
 
The accepted value for the speed of sound in air is 331 m/s at 0ºC. The speed of sound in air increases 0.6 m/s for each Celsius degree above zero. Compute the speed of sound at the temperature of the room you are now in. 

Refer to the following information for the next two questions.

Suppose you set your watch by the sound of the noon whistle from a factory 3 km away.
 
 
 
Compared to the correct time, your watch will be
 

It will differ from the correct time by
 
 
Refer to the following information for the next four questions.

Suppose a child's natural frequency of swinging is once each 4 seconds.
For maximum amplitude the man should push at a rate of once each
 
If the man in previous question pushes in the same direction twice as often, his pushes
 
because
 
Based on this swing example, a 440 hz-tuning fork could NOT be forced into vibration by a sound of
 
Refer to the following information for the next three questions.

Two notes with frequencies of 66 and 70 hertz are "sounded together."
The resulting beat frequency is
 
at a pitch of
 
Beats are the result of the alternate cancellation and reinforcement of two sound waves of
 
 
 



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