Advertisements
Advertisements
प्रश्न
What is a megaphone ? Name the principle on which a megaphone works.
Advertisements
उत्तर
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
संबंधित प्रश्न
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
Displacement distance graph of two sound waves A and B, travelling in a medium, are as shown in the diagram below.
Study the two sound waves and compare their:
1) Amplitudes
2) Wavelengths
A wave passes from one medium to another medium. Mention one property of the wave out of speed, frequency or wavelength which changes.
State two factors on which the speed of a wave travelling in a medium depends.
What is a bulb horn ? Name the principle on which a bulb horn works.
In what respect does waveforms of noise and a musical note differ. Draw diagrams to illustrate your answer.
Explain reflection at the boundary of a rarer medium.
What is meant by an echo? Explain.
