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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
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?
What is the other name of a loud-hailer ?
Fill in the blank with suitable word :
An echo is simply a ................... sound.
Fill in the blank with suitable word :
Echoes are caused by the ...................... of sound.
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 ?
The speed of sound in water is 1500 metres per second. How far away from an under-sea rock should a deep sea diver be so that he can hear his own echo ?
Name any two objects which are good reflectors of sound.
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 ?
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 ?
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.
Answer the following question in your own words.
What factors are important to get a distinct echo?
Rohan conducted experiments on echo in different media. He observed that a minimum distance of 'x' meters is required for the echo to be heard in oxygen and 'y' meters in benzene. Compare 'x' and 'y'. Justify your answer.
Speed of sound in oxygen: 340 ms-1
Speed of sound in benzene: 200 ms-1
