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प्रश्न
What is the other name of a loud-hailer ?
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उत्तर
Megaphone or bullhorn is also called as loudhailer.
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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?
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.
Why do we hear more clearly in a room with curtains than in a room without curtains ?
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
What are the medical applications of echo?
How can you calculate the speed of sound using echo?
Assertion: The sound which we hear again is called Echo.
Reason: The sensation of sound (Echo) persists in our brain for about 1 s.
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
