Question

PLEASE DO FAST TOMMOROW IS MY TEST
The lengths of two closed organ pipes are
0.750 m and 0.770 m. If they are sounded
together, 3 beats per second are produced. The
velocity of sound will be :-
(1) 350.5 m/sec (2) 335.5 m/sec
(3) 346.5 m/sec (4) None of these
Also tell from where the 4/L1 and 4/L2 came
.....​

Answer 1

Answer:

343

fb =|f1-f2|

fb= (v/4L1)-(v/4L2)