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JAMB Physics 2010 Question 27

Question 27

Sound

The velocity of sound in air at 16°C is 340ms−1. What will it be when the pressure is doubled and its temperature raised to 127°C?

  1. A.4,000ms−1
  2. B.160,000 ms−1
  3. C.8,000 ms−1
  4. D.400ms−1
Show the answer and explanation

Answer: D (400ms−1)

Explanation

Pressure has no effect on the speed of sound; v ∝ √T (kelvin). v = 340 × √(400/289) = 340 × 20/17 = 400 m s−1.