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प्रश्न
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?
उत्तर
- Ambient temperature and the distance between the source and the reflecting surface are important factors in the generation of echoes. A distance of at least 17.2 m between the source and the reflecting surface is required for a clear echo to be heard at 22°C.
- The classroom must be designed in such a way that the distance between two walls is less than 17.2 meters to avoid the formation of echoes.
- Also, the ceiling should be curved so that the reflection of sound waves is uniform throughout the room.
- Classrooms are generally rectangular in design to avoid echo generation.
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संबंधित प्रश्न
The minimum distance between the source and the reflector in air. So that an echo is heard is approximately equal to ______.
Which of the following statement best describes frequency?
Which property of sound leads of the formation of echoes ?
What is the other name of a loud-hailer ?
Name the device which is used to address a small gathering of people.
In which medium, air or water, an echo is heard much sooner ? Why ?
Why do we hear more clearly in a room with curtains than in a room without curtains ?
Why are the ceilings of concert halls made curved ? Draw a labelled diagram to illustrate your answer.
State the laws of reflection of sound.
What is the minimum distance in air required from a sound reflecting surface to hear an echo (at 20°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.
A man is kidnapped, blindfolded and imprisoned in a big room. How could the man tell if he was in : a furnished room
An echo-sounder in a trawler (fishing boat) receives an echo from a shoal of fish 0.4 s after it was sent. If the speed of sound in water is 1500 m/s, how deep is the shoal ?
Explain by giving a scientific reason.
We cannot hear the echo produced in a classroom.
Answer the following question in your own words.
Study the construction of the Golghumat at Vijapur and discuss the reasons for the multiple echoes produced there.
What are the medical applications of echo?
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.
Assertion: The sound which we hear again is called Echo.
Reason: The sensation of sound (Echo) persists in our brain for about 1 s.
