Advertisements
Advertisements
प्रश्न
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.
Advertisements
उत्तर
No, he is unable to hear a distinct echo because there should be a 17-meter gap between the man and the reflector.
APPEARS IN
संबंधित प्रश्न
What is the other name of a loud-hailer ?
Why are the ceilings of concert halls made curved ? Draw a labelled diagram to illustrate your answer.
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 ?
What is the minimum distance in air required from a sound reflecting surface to hear an echo (at 20°C) ?
A man is kidnapped, blindfolded and imprisoned in a big room. How could the man tell if he was in : a furnished room
Answer the following question in your own words.
What should be the dimensions and the shape of classrooms so that no echo can be produced there?
What is an echo?
State two conditions necessary for hearing an echo.
To hear an echo, the minimum distance of the obstacle from the source of sound must be ______.
