Name: _______________________

Quiz 2

09/22/2004

Ch. 16-17

Useful Numbers:
speed of sound in air v_{air }=344 m/s.

1) A woman stands 1.2m from speaker A and 2.1m from speaker B. If speakers A and B are out-of-phase, what is the lowest frequency that will destructively interfere at the woman's position?

2) A 440Hz tuning fork is sounded along with the A string on a piano. A beat frequency of 1.5Hz is measured. What are the possible frequencies of the A string?

3)
The formula for the
Doppler shift is: _{}_{}

If the source is going __away__ from the observer and the
observer is going __toward__ the source, what
is the numerator sign?

a) +

b) -

What is the denominator sign?

a) +

b) -