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प्रश्न
What is the minimum distance in air required from a sound reflecting surface to hear an echo (at 20°C) ?
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उत्तर
The minimum distance in air required from a sound-reflecting surface to hear an echo at 20°C is 17.2 m.
संबंधित प्रश्न
Does sound follow the same laws of reflection as light does? Explain.
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 property of sound leads of the formation of echoes ?
Name three devices which work on the reflection of sound.
What is the other name of a loud-hailer ?
In which medium, air or water, an echo is heard much sooner ? Why ?
What is meant by 'reflection of sound' ? What type of surfaces are the best for reflecting sound ?
State the laws of reflection of sound.
What is an echo ? How is echo formed ?
Which of the following device does not work on the multiple reflections of sound waves ?
Explain by giving a scientific reason.
We cannot hear the echo produced in a classroom.
Answer the following question in your own words.
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What is an echo?
How can you calculate the speed of sound using 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 ______.
______ is an image obtained by the use of reflected ultrasonic waves.
Numerical problems:
An echo returned in 3s. What is the distance of the reflecting surface from the source given that the speed of sound is 330 ms-1?
Answer the following question in your own words.
What factors are important to get a distinct echo?
