Question

what is an echo ? State two conditions for echo to be heard bat cannot see still they catch their prey. Explain​

Answer 1

Explanation:

Reflection of sound is known as echo.

Reflection of sound is known as echo.The two conditions for echo to be heard are:1. The minimum distance between source and reflecting surface should be 17.2 m .2. To hear a distinct echo, the interval between original and reflected sound must 0.1 second.Bats cannot see still they catch their prey as they produce ultrasound. This ultrasound is reflected back to the bat if their is any obstacle in its way, and thus bats catch their prey.

Answer 2

Answer:

Echo : An echo can be defined as the phenomena of the reflection of sound produced by a source placed in a relatively open environment after it hits a distant obstacle like a cliff etc. The sound waves that have bounced back can be heard at the source a few seconds after it was produced.