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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
An echo returned in 3 s. What is the distance of the reflecting surface from the source, given that the speed of sound is 342 m s−1?
Does sound follow the same laws of reflection as light does? Explain.
What is the other name of a loud-hailer ?
Fill in the blank with suitable word :
Echoes are caused by the ...................... of sound.
Which of the following device does not work on the multiple reflections of sound waves ?
Explain by giving a scientific reason.
We cannot hear the echo produced in a classroom.
Answer the following question in your own words.
What is an echo?
What is the minimum distance needed for an echo?
What is an echo?
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?
