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प्रश्न
Differentiate between the following:
Light and sound waves.
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उत्तर
| Light waves | Sound waves |
| 1. These are electromagnetic waves. | 1. These are mechanical waves. |
| 2. They can travel in vacuum. | 2. They re qui re a materia I medium for propagation. |
| 3. The speed of light waves is very high ( = 3 x 108 m/s in air). | 3. The speed of sound waves is low ( =3 30 m/s in air). |
| 4. The wavelength of the light waves (visible) is very small, of the order of 10-6 m. | 4. The wavelength of sound waves is in the range of 10-2 m to lOm. |
| 5. These waves are transverse. | 5. These waves are lonaitud ina I waves. |
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संबंधित प्रश्न
In the diagram below, A, B, C, D are four pendulums suspended from the same elastic string PQ. The length of A and C are equal to each other while the length of pendulum B is smaller than that of D. Pendulum A is set into a mode of vibrations
1) Name the type of vibrations taking place in pendulums B and D?
2) What is the state of pendulum C?
3) State the reason for the type of vibrations in pendulum B and C.
The adjacent diagram shows three different modes of vibrations P, Q and R of the same string.
(i) Which vibration will produce a louder sound and why?
(ii) The sound of which string will have maximum shrillness?
(iii) State the ratio of wavelengths of P and R.
Give one example to illustrate forced vibrations.
A vibrating tuning fork, held over an air column of a given length with its one end closed, produces a loud audible sound. Name the phenomenon responsible for it and explain the observation.
When a troop crosses a suspension bridge, the soldiers are asked to break steps. Explain the reason.
State two ways in which resonance differs from forced vibrations.
Explain why does the rear mirror of a motorbike start Vibrating Violently, at some particular speed of motorbike?
Explain a tuning fork (vibrating) is held close to ear. One hears a faint sound. The same vibrating tuning fork is placed on table, such that its handle is in contact with table, one hears a loud sound.
