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. The speed of sound in air is calculated by distance/time. Which of the following will not affect the speed of sound?
I. The frequency of the gunshot.
II. The temperature of the environment
III. The loudness of the gunshot
(a) I and II I
(b) II and III
(c) II and III I and III
(d) II and III
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