Wednesday
August 27, 2014

Homework Help: physics

Posted by cassie on Saturday, May 1, 2010 at 8:43pm.

A train moving with a speed of 31.8 m/s sounds a 136-Hz horn. Suppose a stationary observer sounds a horn that is identical to the one on the train. What frequency is heard from this horn by a passenger in the train.

a) 9.8 Hz
b) 31.8 Hz
c) 99 Hz
d) 115 Hz
e) 149 Hz


The fundamental of a closed organ pipe is 261.6 Hz (middle C). The second harmonic of an open organ pipe has the same frequency

what are the lengths of the closed pipe?
A)1m b) .54m C).48 m d) .33m
What are the lengths of open pipe?
A)1.31m b)1m c).37m d).24m

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