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JAMB Physics 1998 Question 25

Question 25

Sound

The velocity of a sound wave at 27 °C is 360 m s−1. Its velocity at 127 °C is

  1. A.120√3 m s−1
  2. B.240 m s−1
  3. C.240√3 m s−1
  4. D.720√3 m s−1
Show the answer and explanation

Answer: C (240√3 m s−1)

Explanation

v ∝ √T (in kelvin). v = 360 × √(400/300) = 360 × 2/√3 = 240√3 m s−1.