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प्रश्न
Fill in the blank with suitable word :
Echoes are caused by the ...................... of sound.
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उत्तर
Echoes are caused by the reflection of sound.
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संबंधित प्रश्न
Which property of sound leads of the formation of echoes ?
Name the device which is used to address a small gathering of people.
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 ?
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) ?
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?
______ allows bats to navigate through dark caves and find insects for food.
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?
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
