Question

what should be the minimum distance between the source of sound and the reflector in water so that the echo is heard distinctly?speed of sound in wateris 1400m/s

Answer 1

hey mate

here is your answer

let the minimum distance be x

thus,the total distance=2x. (as sound returns towards the source after being reflected)

time=0.1 s (persistence of hearing)

speed of the sound in water=1400 m/s (given)

thus,

2x=1400*0.1

=>x=140/2

=>x=70m(answer)


✨✨✨✨ ALWAYS BE BRAINLY ✨✨✨✨

Answer 2

hey mate

here is your answer

let the minimum distance be x

thus,the total distance=2x. (as sound returns towards the source after being reflected)

time=0.1 s (persistence of hearing)

speed of the sound in water=1400 m/s (given)

thus,

2x=1400*0.1

=>x=140/2

=>x=70m(answer)

✨✨✨✨ ALWAYS BE BRAINLY ✨✨✨✨