WAEC Physics 2020 Objective — Question 22
Question 22 of 50 from the West African Examinations Council (WAEC) Physics 2020 Objective paper, with the correct answer and a full explanation.
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The velocity of sound in air at 15 C is 340 ms^-1. Calculate the velocity at 47 C.
- A. 790 ms^-1
- B. 602 ms^-1
- C. 358 ms^-1Correct
- D. 322 ms^-1
Explanation
Given V1=340m/s, T1=15C=288K, T2=47C+273=320K. Since V is proportional to sqrt(T) (absolute temperature), V2=V1 x sqrt(T2/T1)=340 x sqrt(320/288)=340 x sqrt(1.11)=340x1.0536=358.21 m/s.
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