Q.

A wave of frequency 100Hz is set along a string towards a fixed end. After reflection a node is formed at 10cm from the fixed end. The speed of the incident as reflected wave is

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4 m/s

20 m/s

10 m/s

15 m/s

answer is 2.

(Detailed Solution Below)

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Detailed Solution

Node to node distance = λ2 λ2=10 λ=20 cmv=nλ=100×20 cm/s =20 m/s.

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