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JAMB Physics 1998 Question 27

Question 27

Waves

A steel wire of length 0.50 m is stretched between two fixed points and its fundamental frequency is 200 Hz. The speed of the wave in the wire is

  1. A.100 m s−1
  2. B.120 m s−1
  3. C.200 m s−1
  4. D.250 m s−1
Show the answer and explanation

Answer: C (200 m s−1)

Explanation

For the fundamental, λ = 2L = 1.0 m. v = fλ = 200 × 1.0 = 200 m s−1.