In an experiment to determine the speed
of sound, a gun was fired and an observer
at a distance away measured the time
interval between seeing the flash of the
gun and hearing the shot. Which of the
following will not affect the result?
1. The frequency of the gunshot.
2. The temperature of the environment.
3. The loudness of the gunshot.
A 1 and 2 only
B 2 and 3 only
C 1 and 3 only
D 1, 2 and 3
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