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JEE Main Physics Class 11 Waves Part 1 Questions
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© examsnet.com
Question : 15
Total: 100
A uniform thin rope of length 12 m and mass 6 kg hangs vertically from a rigid support and a block of mass 2 kg is attached to its free end. A transverse short wave-train of wavelength 6 cm is produced at the lower end of the rope. What is the wavelength of the wavetrain (in cm) when it reaches the top of the rope ?
[Sep. 03, 2020 (I)]
3
6
12
9
Validate
Solution:
Using,
V
=
f
λ
V
1
λ
1
=
V
2
λ
2
⇒
λ
2
=
V
2
V
1
λ
1
Again using,
n
=
V
λ
=
√
T
M
λ
2
=
√
T
2
T
1
λ
1
T
2
=
8
g
(
Top
)
=
√
8
g
2
g
λ
1
=
2
λ
1
=
12
c
m
T
1
=
2
g
(
Bottom
)
© examsnet.com
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