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प्रश्न
In which medium, air or water, an echo is heard much sooner ? Why ?
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उत्तर
An echo is heard sooner in water because sound travels faster in water than in air as the speed of sound depends on the density of propagating medium.
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संबंधित प्रश्न
Name three devices which work on the reflection of sound.
On which day, a hot day or a cold day, an echo is heard sooner ? Give reason for your answer.
State the laws of reflection of sound.
What is an echo ? How is echo formed ?
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.
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 ?
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?
What is the minimum distance needed for an echo?
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
