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प्रश्न
Which property of sound leads of the formation of echoes ?
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उत्तर
Echoes are formed due to reflection of sound waves.
संबंधित प्रश्न
An echo returned in 3 s. What is the distance of the reflecting surface from the source, given that the speed of sound is 342 m s−1?
When a sound is reflected from a distant object, an echo is produced. Let the distance between the reflecting surface and the source of sound production remains the same. Do you hear echo sound on a hotter day?
A man is standing at a distance of 12 m from a cliff. Will he be able to hear a clear echo of his sound? Give a reason for your answer.
Which of the following statement best describes frequency?
What is the other name of a loud-hailer ?
Fill in the blank with suitable word :
Echoes are caused by the ...................... of sound.
In which medium, air or water, an echo is heard much sooner ? Why ?
The echo of a sound is heard after 5 seconds. If the speed of sound in air be 342 m/s, calculate the distance of the reflecting surface.
What is meant by 'reflection of sound' ? What type of surfaces are the best for reflecting sound ?
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.
Explain by giving a scientific reason.
We cannot hear the echo produced in a classroom.
What is the minimum distance needed for an echo?
A man is standing between two vertical walls 680 m apart. He claps his hands and hears two distinct echoes after 0.9 seconds and 1.1 seconds respectively. What is the speed of sound in the air?
State two conditions necessary for hearing an echo.
When sound is reflected from a distant object, an echo is produced. Let the distance between the reflecting surface and the source of sound remain the same. Do you hear an echo sound on a hotter day? Justify your answer.
To hear an echo, the minimum distance of the obstacle from the source of sound must be ______.
Assertion: The sound which we hear again is called Echo.
Reason: The sensation of sound (Echo) persists in our brain for about 1 s.
