Name: _______________________

Quiz 2


Ch. 16-17


Useful Numbers:  speed of sound in air vair =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) -