(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
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
(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 = 5 s
That's the time it takes.
To know more about echo, visit:
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