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प्रश्न
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उत्तर
| Electromagnetic waves | Mechanical waves |
| 1. They can travel in vacuum. | 1. They cannot travel in vacuum. They need a materia I medium for their propagation. |
| 2. These are formed by the periodic vibrations of mutually perpendicular electric and magnetic field in a plane normal to the direction of wave propagation. | 2. These are formed by the vibrations of the medium particles about their mean positions. These vibrations can be along the direction of propagation of wave or perpendicular to it.. |
| 3. These are traverse in nature. | 3. These waves can be transverse as well as IonqitudnaI. |
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संबंधित प्रश्न
A certain sound has a frequency of 256 hertz and a wavelength of 1.3 m.
1) Calculate the speed with which this sound travels
2) What difference would be felt by a listener between the above sound and another sound traveling at the same speed, but of wavelength 2.6 m?
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 amplitude term in relation to a wave.
What do you mean by reflection of sound? State one condition for the reflection of a sound wave. Name a device in which reflection of sound wave is used.
What is meant by echo depth sounding?
How are bats able to fly in the dark?
A radio signal, sent towards the surface of the moon, is received in 2.5 seconds. If the speed of the radio waves is 3 × 108 ms−1, find the distance of the moon from the earth.
What is mean by the reflection of sound?
The direction of the incident sound, the direction of reflected sound, and the normal are in different Planes.
