1. The back wall of an auditorium is 33.0m from the stage. If you are seated in
ID: 1293036 • Letter: 1
Question
1. The back wall of an auditorium is 33.0m from the stage. If you are seated in the middle row, how much time elapses between a sound from the stage reaching your ear directly and the same sound reaching your ear after reflecting from the back wall? The speed of sound in the air is 343 m/s. Answer in seconds please!
2. In the deep ocean, a water wave with wavelength 95 m travels at 12 m/s. Suppose a small boat is at the crest of this wave, 1.0m above the equilibrium position. What will be the vertical position of the boat 8.0s later?
3. What is the wavelength of a 2.3MHz ultrasound wave traveling through aluminum? Assume that the speed of sound in aluminum is 5100 m/s.
4. What frequency of electromagnetic wave would have the same wavelength as the ultrasound wave of part A?
Explanation / Answer
the distance of the middle row=16.5 m
distance covered by sound in first case=16.5 m
in second case=33+16.5=49.5 m
we know velocity of sound=343 m/s
so
time in first case=33/343
time in second case=49.5/343
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