A dog barks in a park and hear 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 isA) 86.5 mB) 80.6 mC) 75 mD) 8.65 m
Let the distance between the dog and the building be x.
When the dog barks, the sound covers the distance x and gets reflected back from the building after covering distance x once again so that echo is heard.
So, the sound covers 2x distance in 0.5 s.
Therefore,
Therefore, the correct option is A.
When the dog barks, the sound covers the distance x and gets reflected back from the building after covering distance x once again so that echo is heard.
So, the sound covers 2x distance in 0.5 s.
Therefore,
Therefore, the correct option is A.