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Question

Which of the following statement(s) is/are correct?



A

Light waves can travel in vacuum but sound waves cannot travel in vacuum.

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B

Speed of light in liquids is less as compare to gases but speed of sound in liquids is more as compare to gases.

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C

Light waves are transverse electromagnetic waves while sound waves are longitudinal mechanical waves.

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D

During lightning, thunder is heard much earlier than it is seen.

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Solution

The correct options are
A

Light waves can travel in vacuum but sound waves cannot travel in vacuum.


B

Speed of light in liquids is less as compare to gases but speed of sound in liquids is more as compare to gases.


C

Light waves are transverse electromagnetic waves while sound waves are longitudinal mechanical waves.


Light waves can travel in the vacuum. sound energy travels from one place to other by transfer of vibrations between particles. So, sound cannot travel in the vacuum because there are no particles in vacuum.

The speed of sound depends on the elasticity of the medium. The elasticity of liquid is more than that of gas so the speed of sound in the liquid is more than that of gas. Elasticity is the ability of a material to restore to its normal shape after being disturbed.

The speed of light is more than the speed of sound so lightning is seen earlier than thunder is heard.


Physics

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