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प्रश्न
Does light travel faster in air than in water? Why?
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उत्तर
Yes, light travels faster in the air than water. Because light does not require any medium for their propagation and they are not mechanical waves. The quantities which oscillate in light are mechanical and electric fields. And electric and magnetic fields decrease with the medium in between them. So, light travels faster in the air than water.
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संबंधित प्रश्न
Choose the correct word/words to complete the following sentence :
When sound travels in a medium ____________
How is the frequency of a wave related to its time period?
How does the speed of sound change with change in (i) amplitude and (ii) wavelength, of sound wave?
How does the following factor affect, if at all, the speed of sound in air:
Moisture in air
The time period of a simple pendulum is 2 s. Find its frequency.
State four differences between the sound wave and the light wave.
Is the speed of sound different in different media?
Describe in brief, with the aid of a sketch diagram, an experiment to demonstrate that a material medium is necessary to transmit sound.
How are sound waves produced? How are sound waves transmitted from one place to the other?
How will the following factors affect the speed of sound in air:
Wind.
