- #1
JessicaHelena
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- 3
Homework Statement
A radio speaker produces sound when a membrane called a diaphragm vibrates, as shown above. A person turns up the volume on the radio. Which of the following aspects of the motion of a point on the diaphragm must increase?
a) the max. displacement only
b) the average speed only
c) both a) and b)
d) neither a) nor b)
(This is an AP Physics 1 sample problem)
Homework Equations
v=f * lambda (?)
The Attempt at a Solution
I know that the displacement will increase bc a louder volume leads to a greater amplitude (which is the displacement). The answer says that the average speed too must increase (it is choice c), but I'm having a hard time understanding that: I thought that loudness — and so amplitude — has nothing to do with the speed.