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Questions  

Length of a string tied to two rigid supports is 80cm .  Maximum wavelength in cm of a stationary wave produced on it is

a
20 cm
b
80 cm
c
40 cm
d
160 cm

detailed solution

Correct option is D

Given Length of string l=80 cm  l=λ280=λ2⇒ λ=20×80=160  cm

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A wire having a linear density of 5 g/m is stretched between two rigid supports with a tension of 450 N. It is observed that the wire resonates at a frequency of 420 Hz. The next highest frequency at which the same wire resonates is 490 Hz. Find the length of the wire. (in m)


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