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
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, the correct option is A.