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Q.

A wave of frequency 200 Hz  is sent along a string towards a fixed end.  When this wave travels back then after reflection, a node is formed at a minimum distance of 5 cm from the fixed end of the string.  The speed  of the incident wave is

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a

10 m/s

b

40 m/s

c

20 m/s

d

5 m/s

answer is A.

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Detailed Solution

Frequency n=200 Hz

Length l=5 cm

As   l=λ2

5=λ2

λ=10 cm

v=nλ

=200×10

=2000 cm/s

=20 m/s

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