A siren having a ring of 200 hole makes 132 rev/min. A jet of air is directed on the set of holes. Calculate the frequency and wavelength in air of the note produced (take v = 350m/s)
A
0.795m
B
0.625m
C
0.335m
D
0.125m
Verified Correct Answer: A.
Physical Principles & Numerical Solution
n = 200, S = 132 rev/min, v = 350m/s\(^2\)
f
=
ns
=
200
\times
132
rev
min
\times
1min
60s
=
440Hz
\lambda
=
v
f
=
350
440
=
0.795m
Source: WAEC / JAMB / NECO Classroom Archive (Record #55265)