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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?
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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
Does sound follow the same laws of reflection as light does? Explain.
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?
What is meant by an echo?
Which of the following statement best describes frequency?
Name three devices which work on the reflection of sound.
Fill in the blank with suitable word :
An echo is simply a ................... sound.
On which day, a hot day or a cold day, an echo is heard sooner ? Give reason for your answer.
In which medium, air or water, an echo is heard much sooner ? Why ?
Why are the ceilings of concert halls made curved ? Draw a labelled diagram to illustrate your answer.
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 ?
Which of the following device does not work on the multiple reflections of sound waves ?
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.
______ allows bats to navigate through dark caves and find insects for food.
______ is an image obtained by the use of reflected ultrasonic waves.
