An explosion occurs at an altitude of 312 m above the ground. If the air
PHYSICS
JAMB 2023
An explosion occurs at an altitude of 312 m above the ground. If the air temperature is -10.00°C, how long does it take the sound to reach the ground?
[velocity of sound at 0° C = 331 ms-1]
- A. 0.94s
- B. 0.96s
- C. 0.93s
- D. 0.95s
Correct Answer: B. 0.96s
Explanation
d=312m.,T =263\(-10^°c\) = -10+273K = 263K, t=?
v= 331√ \(\frac{T}{273}\)
⇒ v = 331×√ \(\frac{263}{273}\)
⇒ v = 324.88 \(ms^-1\)
⇒ v = \(\frac{d}{t}\)
t = \(\frac{d}{t}\) = \(\frac {312}{324.88}\)
t = 0.96s
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