Question

What cannot talk but will always reply when spoken to ???

Answer 1

heya user

Echo is the answer

Answer 2

Echo

• Echo is your own voice that sounds on the phone when you speak.
• If the amplitude of the echo is small, you won't notice it and talking won't be a problem.
• However, if the echo interval exceeds approximately 25 milliseconds (ms), it will be heard in the speaker.
• An echo is a sound that repeats itself when a sound wave returns.
• Sound waves can bounce off soft and hard objects in the same way that a rubber ball bounces off the ground.
• The direction of the sound changed, but the echo sounded the same as the original sound.

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