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  • A wave of frequency 100 Hz is sent along a string towards a fixed end. When this wave travels back, after reflection, a node is formed at a distance of 10 cm from the fixed end of the string. The s

A wave of frequency 100 Hz is sent along a string towards a fixed end. When this wave travels back, after reflection, a node is formed at a distance of 10 cm from the fixed end of the string. The speeds of incident (and reflected ) waves are -

Option: 1

48 m/s


Option: 2

20 m/s


Option: 3

10 m/s


Option: 4

15 m/s


Answers (1)

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Given,\mathrm{ \frac{\lambda}{2}=10 \mathrm{~cm}=0.1 \mathrm{~m} \text { or } \lambda=0.2 \mathrm{~m} }

 

Now, \mathrm{\begin{aligned} v=f \lambda & =100 \times 0.2 \\ & =20 \mathrm{~m} / \mathrm{s} . \end{aligned}}

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