Question

a girl hand design a clap switch for science exhibition that enabled her to switch on or off an alarm just with clapping of hands while testing her device in a hall she noticed that was the alarm was sounded it followed with another one due to echo of the clap that is the sound reflected by the walls she recorded the two soundings of alarm with their tape recorder and found out that time difference in between them is 0.1s if the distance of the walls is 15 M calculate the speed of sound

Answer 1

Use simple speed =distance/time
Here the sound(echo) travels twice the distance of hall..
Because 15 m while striking the wall and 15m while returning to alarm clock

Distance will be 15+15 =30m
Time is given 0.1s
Now speed =distance/time

I think you would be able to solve the rear which is just dividing distance with time...

^_^

Answer 2

Answer:

distance will be 15+15 = 30m

time is given 0.1 sec

now, speed =s/t

30/0.1 =300m/s