Question

A dog barks in a park and hears its echo after 0.5 seconds. The sound of its bark got reflected by a nearby building. The sound of speed in air is 346 m/s. The distance between the dog and the building is...

Answer 1

hope this helps you......

Answer 2

DISTANCE BETWEEN DOG AND BUILDING IS 86.5 metres.

Given:

• Dog hears echo after 0.5 seconds.
• Speed of sound = 346 m/s.

To find:

Distance from dog and building?

Calculation:

When the dog barked, the sound wave travelled towards the building and then got reflected from the building. Then it travelled the same distance back to the dog's ear.

So, let distance between dog and building is x.

Hence, the sound wave travelled (x+x) = 2x distance in that 0.5 sec.

Hence, we can say:

$2x = v \times t$

$\implies \: 2x = 346 \times 0.5$

$\implies \: x = 346 \times \dfrac{1}{4}$

$\implies \: x =86.5 \: m$

So, distance between dog and building is 86.5 metres.