Question

a person fire a gun in front of a building 167 M away if the speed of sound is 334 ms^-/1 calculate the time in which he has an echo

Answer 1

Thanks for your question !

   The time for an echo to be heard will be as follows -

We know,
    Time is equal to distance travelled and speed's division. The time (t) is 330 m/s.

    Now, distance is 55 m. But, echo - the sound will be reverse to be travelled. Hence, twice = 55 + 55 = 110 m.

     t = d / s
       = 110 / 330
       = 11 / 33
       = 1 / 3
       = 0. 33 s
    Hence, the time taken for echo to be heard is 0. 33 seconds.

Answer 2

d = 167  

2d = 167 x 2  m  

Speed of sound = 332 m/s

t for echo to be heard = ?

t = 2d/speed  

= 167x2/332  

= 1.00 Sec

The time in which the echo can be heard is 1.00 seconds.