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AP® Physics 1 & 2

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Moderate

Sound Lab Temperature

APPH12-D6WRMF

Students are experimenting with a tuning fork and a long tube filled with water. There is a second tube inside the first and it can be raised and lowered to change the length of the column of air above the water level.

The students hear a louder resonance at position of 33 centimeters above the water.

Based on this experiment, predict what will change when the experiment is repeated on a day when the temperature in the room increases by 10 degrees Celsius.

A

The frequency that the students hear will be increased because the speed of sound increases in warmer air.

B

The inner tube must be lowered by 10% to reach an audible resonance to offset the 10 degree temperature increase.

C

No change is needed since temperature is not a factor with the wave equation that relates only frequency, wavelength and wave speed.

D

The inner tube must be raised to increase the section of air that vibrates in resonance.