A boy standing 408m from a wall blew a trumpet and heard the echo 2.4s later. Calculate the speed of the sound
A
310m/s
B
320m/s
C
330m/s
D
340m/s
Verified Correct Answer: D.
Physical Principles & Numerical Solution
The distance to the wall is 408m, so the total distance (D) traveled by the sound is: D = 2 \times 408m = 816m
But v = \(\frac{d}{t}\) = \(\frac{816}{2.4}\) = 340m/s
Source: Myschool Past Questions Archive (Record #71633)