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Olympiad-Science
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Class 9
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Q)
The property of sound which is used in stethoscope is
(
a
)
E
c
h
o
(
b
)
M
u
l
t
i
p
l
e
r
e
f
l
e
c
t
i
o
n
(
c
)
U
l
t
r
a
s
o
u
n
d
(
d
)
I
n
f
r
a
s
o
u
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d
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