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 \(0^oC\) = 331 ms-1]
A
0.94s
B
0.96s
C
0.93s
D
0.95s
Verified Correct Answer: B.
Physical Principles & Numerical Solution
d=312m.,T =263\(-10^^\circc\) = -10+273K = 263K, t=?
v= 331\sqrt \(\frac{T}{273}\)
⇒ v = 331\times\sqrt \(\frac{263}{273}\)
⇒ v = 324.88 \(ms^-1\)
⇒ v = \(\frac{d}{t}\)
t = \(\frac{d}{t}\) = \(\frac {312}{324.88}\)
t = 0.96s
Source: WAEC / JAMB / NECO Classroom Archive (Record #68564)