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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 speeds of incident (and reflected) waves are
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- 5 m/s
- 10 m/s
- 20 m/s
- 40 m/s
Correct Option: C
As fixed end is a node, therefore, distance between two consecutive nodes
| - | - 10 cm. | |
| 2 |
λ = 20 cm = 0.2 m
As v - nλ ∴ v = 100 × 0.2 = 20 m/s
