Physics, asked by Mathematics2147, 1 year ago

(a) What is an echo ? How is echo formed ?
(b) What is the minimum distance in air required from a sound reflecting surface to hear an echo (at 20°C) ?
(c) A man standing 825 metres away from a cliff (steep rock) fires a gun. After how long will he hear its echo ? Speed of sound in air is 330 m/s.

Answers

Answered by rk2250297
2

Answer:

Echo is the reflection of sound when it reflects 200 times then we observe one echo , the maximum distance for reflecting of an echo in the air is 17.5m, and minimum distance is 17.5mm , hope it will help you mark me brainliest

Answered by bhuvna789456
1

(a) The sound repetition induced by audio reflection is called echo.

(b) The required distance in air needed to hear an echo at 20 ° C from a sound-reflecting surface is 17.2 m.

(c) t = 5 s  , That's the time it takes.

Explanation:

(a) The sound repetition induced by audio reflection is called echo. When sound is reflected from a hard surface, like a tall brick wall or a cliff, an echo is created.

(b) The required distance in air needed to hear an echo at 20 ° C from a sound-reflecting surface is 17.2 m.

(c) To hit the reflecting surface we must measure the time required by the audio wave.

STEP:1 Given values in the question

Distance (d) = 825 m

sound velocity ν = 330 m/s

STEP:1 Taken to reach the reflective surface by sound wave is,

t = \frac{2d}{v}

t = \frac{2*825}{330}

t = \frac{1650}{330}

t = 5 s

That's the time it takes.

To know more about echo, visit:

1 Why do we not get echo at all places?

https://brainly.in/question/1027978

Define echo. state two condition of echo to heard.

https://brainly.in/question/1136760

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