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) -