Question

should be the distance of the cliff if a person needs to hear the echo of his voice after 5 second provide speed of the sound is 345 metre per second​

Answer 1

Answer:

v=2d/t

so,

345×5/2=d

d=862.5m

maybe

Answer 2

Echo is the bouncing back of sound waves after striking a distant object.

.) Now we know that ,

Speed = distance / time

.) Now in case of echo , sound has to cover double distance ie

Speed = 2* distance / time

Let speed = s

Distance = d

Time = t

.) Now in case of echo ,

s = 2*d / t

Now it is given that ,

s = 345 m/sec

t = 5 sec

Now ,

345 = 2*d / 5

d = 345 *5 / 2

d = 862.5m