Question

Jamal blasts an air-horn to start a race. Lewis hears the horn from his house 274 meters away. Given that sound travels through air at 340 m/s, how long did it take the sound to travel from Jamal to Lewis?

440 s
0.81 s
1.2 s
66 s

Answer 1

(274 meters) x (1 sec / 340 meters)

= (274 / 340) sec

= 0.806 second (rounded)

Answer 2

Answer : Time taken by sound to travel from Jamal to Lewis is 0.81 s.

Explanation :

Given that,

Lewis hears the horn from his house 274 meters away.

The speed of the sound is
`v_s=340\ m/s`

We have to find the time taken by the sound to travel from Jamal to Lewis. For this we will use the definition of speed which is given by :

`v_s=(d)/(t)`

or

`t=(d)/(v_s)`

`t=(274\ m)/(340\ m/s)`

`t=0.805\ s`

or

`t=0.81\ s`

So, the correct option is (b).

Hence, this is the required solution.