Question text
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 9.4s and the speed of sound is 320m/s. NOT TO SCALE student wall x What is the distance x between the student and the wall? A 140m B 150m C 270m D 300m
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 9.4s and the speed of sound is 320m/s.
NOT TO
SCALE
student
wall
x
What is the distance x between the student and the wall?
A 140m B 150m C 270m D 300m
Select your answer: