KEAM 2016 Physics and Chemistry Paper

Velocity of sound =330ms−1
Length of closed pipe =22cm=22×10−2m
Fundamental trequency of stationary wave.
v0‌‌=‌

v

4l

=‌

330

4×22×10−2

‌‌=‌

330×102

4×22

=‌

3000

8

v0‌‌=375Hz
3v0‌‌=375×3=1125
5v0‌‌=5×375=1875
5th harmonic
number of nodes =3
Note : In closed pipe, odd harmonics are produced