If the time taken in an echo is 5 seconds, which among the following will be the approximate distance of the object from source of sound? (assume normal room temperature at 20°C)

Answer: [C] 857 meters

The time taken by the sound waves in going and coming back is 5 seconds, i.e. 2.5 second to reach and 2.5 seconds to come back. So the object is placed 343 x 2.5= 857 meters

This question is a part of GKToday's Integrated IAS General Studies Module