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प्रश्न
What is a bulb horn ? Name the principle on which a bulb horn works.
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उत्तर
A bullhorn is a cone-shaped wind instrument that is used for signaling in bicycles, cars, buses, trucks, boats, etc. A bullhorn works on the principle of multiple reflections of sound.
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संबंधित प्रश्न
Name the characteristic of sound in relation to its waveform
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
Define wave velocity term in relation to a wave.
A wave passes from one medium to another medium. Mention one property of the wave out of speed, frequency or wavelength which changes.
Name the waves which are used in sonar to find the depth of a sea. Give one reason for their use.
Name two sound absorbing materials (or objects) which can make our big room less echoey.
What is a soundboard ? Explain the working of a soundboard with the help of a labelled diagram.
Define the term Frequency (as applied to sound waves)
A type of electromagnetic wave has a wavelength of 50 Å. Name the wave and state one use of this type of wave.
Waves produced on the surface of the water are formed to move with a velocity of 24 ms−1. If the wavelength of these waves equals 20 cm. find the
(i) frequency (no. of waves produced per second)
(ii) the time period (i.e. the time required to produce one wave) for these waves.
