NEET-XI-Physics
exam-2 year:2016
- #133The second overtone of an open organ pipe has the
same frequency as the first overtone of a closed pipe
L metre long. The length of the open pipe will be
(1)``\frac {L}{2}``
(2) 4 L
(3) L
(4) 2 LdigAnsr: 4Ans : (4)
Sol. For second overtone (3rd harmonic) in open organ
pipe,
0
0
3 2
2 3
= &implies; =
for first overtone (3rd harmonic) in closed organ pipe,
C
C
3 4 4L
4 3 3
= &implies; = =
So, 0 0
2 4L
2L
3 3
= &implies; =