Advertisements
Advertisements
Question
What is a megaphone ? Name the principle on which a megaphone works.
Solution
A megaphone is a large cone-shaped device used for amplifying and directing the voice of a person who speaks into it. A megaphone works on the principle of multiple reflections of sound. It is used for addressing a small gathering of people.
APPEARS IN
RELATED QUESTIONS
The human ear can detect continuous sounds in the frequency range from 20 Hz to 20,000 Hz. Assuming that the speed of sound in air is 330 ms1 for all frequencies; calculate the wavelengths corresponding to the given extreme frequencies of the audible range
Define amplitude term in relation to a wave.
What is a soundboard ? Explain the working of a soundboard with the help of a labelled diagram.
Explain how the principle of echo is used by
The dolphin to locate small fish as its prey
Write the approximate value of the speed of sound in water.
Why is an echo not heard when the distance between the source of sound and reflection body is less than 10 m?
Explain reflection at the boundary of a rarer medium.
Write short notes on reflection of sound waves from plane and curved surfaces.
