JAMB Physics 2010 Objective — Question 27
Question 27 of 50 from the Joint Admissions and Matriculation Board (JAMB) Physics 2010 Objective paper, with the correct answer and a full explanation.
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27. The velocity of sound in air at 16C is 340ms-1. What will it be when the pressure is doubled and its temperature raised to 127C? A. 4,000ms-1 B. 160,000 ms-1 C. 8,000 ms-1 D. 400ms-1
- A. 4,000ms-1
- B. 160,000 ms-1
- C. 8,000 ms-1
- D. 400ms-1Correct
Explanation
V is proportional to sqrt(T). T1=16C=289K, T2=127C=400K. V2 = V1 x sqrt(T2/T1) = 340 x sqrt(400/289) = 400ms-1. The velocity of sound in air is not affected by pressure; but for temperature, we have V proportional to sqrt(T).
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