Question

6. Echo is a type of
a.Reflected sound
b.Polarised sound
c.Refracted sound
d.None of these​

Answer 1

Answer:

echo is a type of reflection of sound it is produced when source and reflecting surface is more than 17m apart.

so the answer is A.

Explanation:

hope it helps you

Answer 2

Answer:

MARK ME AS BRAINLIEST

Explanation:

echo is a reflection of sound that arrives at the listener with a delay after the direct sound. The delay is directly proportional to the distance of the reflecting surface from the source and the listener. 

SO YOUR ANSWER IS OPTION A