Physics · May / June 2024 · Paper 11 · Question 28

A student claps his hands in front of a wall and hears the echoes. He claps at the same moment as he hears the echo of the previous clap. Another student starts a stop-watch on the first clap and stops it on the eleventh clap. The reading on the stop-watch is 9.4 s and the speed of sound is 320 m / s. [diagram: student clapping in front of a wall, distance x between student and wall, NOT TO SCALE] What is the distance x between the student and the wall?

1. A140 m
2. B150 m
3. C270 m
4. D300 m

As printed in the paper