Question

1. Echo (इको) क्या है ?
2.इको कब महसूस होती है ?
a. हवा तेज होने पर
b.हवा धीमी होने पर (हवा में खामोशी)
☆Please answer friends.......

Answer 1

heya friend
here is your answer.
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reflection of sound is known as echo.

in my opinion echo dono hi options mein mehsus hoti h.
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hope it will help you.

Answer 2

Eco is a sound that is a copy of another sound and that is produced when sound waves bounce off a surface 
and it feels in both the conditions of air

Hope this helps you dude all the best be brainlist have a great day ✌️✌️✌️