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Byju's Answer
Standard XII
Physics
Periodic Motion
The critical ...
Question
The critical frequency of the layer is:
A
2
H
z
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B
2.7
H
z
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C
2.78
k
H
z
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D
2.7
M
H
z
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Solution
The correct option is
D
2.7
M
H
z
f
c
=
9
√
N
m
=
9
×
√
9
×
10
10
=
2.7
×
10
6
H
z
=
2.7
M
H
z
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