Question

Two sounds $A$ and $B$ are of the same amplitudes, same wave forms, but of frequencies $f$ and $2f$ respectively. Then:

• A. $B$ differ in quality from $A$
• B. $B$ is flat, $A$ is shrill
• C. $B$ is shrill, $A$ is flat
• D. $B$ is louder than $A$

Answer 1

Answer: (C)

$B$ is shrill, $A$ is flat

Amplitude determines the loudness of a sound wave. Frequency determines the pitch or shrillness of the sound. The shrillness of a sound is directly proportional to the frequency of the sound wave. Therefore, sound $B$ is shrill and sound $A$ is flat as the frequency of $B$ is more than that of $A$.