The given graph shows the frequency of sound emitted by a source for 30 seconds. For
how many seconds a normal human being be able to hear the sound?
A 10 s
B 20 s
C 30 s
D 25 s
The given graph shows the frequency of sound emitted by a source for 30 seconds. For
how many seconds a normal human being be able to hear the sound?
A 10 s
B 20 s
C 30 s
D 25 s