A) both the instruments produce sounds of equal pitch
B) both the instruments produce sounds of equal amplitudes
C) the detector is placed at an equal distance from the two sources
D) the distance between the detector and the sources changes continuously
Correct Answer: C
Solution :
During a test for comparison, the test conditions and the variables must be equal for all the cases. Loudness of a sound depends on the distance of the sound detector from the source. Therefore, to compare the loudness of sounds produced by two instruments, the detector must be placed at an equal distance from the two sources. The correct answer is C.
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