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Byju's Answer
Standard IX
Physics
Frequency
A sound wave ...
Question
A sound wave completes
20
vibrations in
2.5
s
. Its frequency will be equal to :
A
20
H
z
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B
8
H
z
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C
200
H
z
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D
50
H
z
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Solution
The correct option is
A
8
H
z
We have,
F
r
e
q
u
e
n
c
y
=
N
u
m
b
e
r
o
f
v
i
b
r
a
t
i
o
n
T
i
m
e
t
a
k
e
n
It is given that the sound wave completes 20 vibrations in 2.5 seconds
Hence,
F
r
e
q
u
e
n
c
y
=
20
2.5
=
8
H
z
Suggest Corrections
0
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