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A boy plucks at the centre of a stretched string of length 1 m and abserves a wave pattern.

1. Which type of wave is produced on the string?

2. What are the conditions for the formation of the above mentioned wave?

3. The distance between consecutive nodes is

  1. λ
  2. λ/2
  3. λ/4

4. A steel rod100 cm long is clamped at its middle. The fundamental frequency of longitudiral vibrations of the rod is given to be 2.5kHz. What is the speed of sound in steel?

1 Answer

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Best answer

1. Standing wave (or) stationary wave

2. Same frequency, same amplitude, travelling in opposite direction.

3. λ/2

4. Length of the rod l = \(\frac{λ_1}{2}\)

λ1 = 2l =2m

v = ν1λ1

v = 2500 × 2 = 5000 m/s.

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