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प्रश्न
Name the device which is used to address a small gathering of people.
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उत्तर
Megaphone or bullhorn is a device that is used to address a small gathering of people.
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संबंधित प्रश्न
Does sound follow the same laws of reflection as light does? Explain.
The minimum distance between the source and the reflector in air. So that an echo is heard is approximately equal to ______.
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.
The echo of a sound is heard after 5 seconds. If the speed of sound in air be 342 m/s, calculate the distance of the reflecting surface.
State the laws of reflection of sound.
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 are the medical applications of echo?
When sound is reflected from a distant object, an echo is produced. Let the distance between the reflecting surface and the source of sound remain the same. Do you hear an echo sound on a hotter day? Justify your answer.
What is an echo? Write the conditions to hear an echo.
