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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?
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.
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.
Why do we hear more clearly in a room with curtains than in a room without curtains ?
What is meant by 'reflection of sound' ? What type of surfaces are the best for reflecting sound ?
What is an echo ? How is echo formed ?
A man is kidnapped, blindfolded and imprisoned in a big room. How could the man tell if he was in : a furnished room
The frequencies of four sound waves are given below. Which of these sound waves can be used to measure the depth of sea by the echo method ?
Which of the following device does not work on the multiple reflections of sound waves ?
Answer the following question in your own words.
What is an echo?
What is an echo?
State two conditions necessary for hearing an echo.
What are the medical applications of echo?
How can you calculate the speed of sound using echo?
______ 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?
