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Light can travel in vacuum whereas sound...

Light can travel in vacuum whereas sound can not do so. Why?

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Light is electromagnetic wave and does not require any material medium to propagate.
Sound is mechanical wave and can travel only in material medium.
Hence light travels in vacuum but sound cannot.
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MBD -HARYANA BOARD-OPTICS-OBJECTIVE TYPE QUESTIONS
  1. Light can travel in vacuum whereas sound can not do so. Why?

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  2. The focal length of a thin lens in vacuum is f. If the material of the...

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  3. Blue colour of sky is due to phenomenon of :

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  4. The power of a lens of focal length 0.5 m is :

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  5. Two lens of power - 12D and + 7D are in contact with each other, the f...

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  6. Optical fibre are based on

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  7. What is f in mirror formula (1)/(u)+(1)/(v)=(1)/(f) ?

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  8. For a normal eye, the least distance of distinct vision is

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  9. On which principle optical fibre is based ?

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  10. The ratio of intensities of two waves are given by 4:1. The ratio of t...

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  11. For the sustained interference of light, the necessary condition is th...

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  12. If two waves of intensity I and 4 I are super impose, then the minimum...

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  13. RAINBOW

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  14. Which of the following represents correct mirror formula ?

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  15. What is the unit of focal length ?

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  16. The focal length of a lens of power + 4D is :

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  17. Derive lens maker's formula for a thin convex lens.

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  18. The velocity of light in vacuum can be changed by changing

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  19. The focal length of a lens of power – 2D is :

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  20. Polarisation can be produced by

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  21. The refractive index of water is 1.33. What will be the speed of light...

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