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Can light travel in vacuum ?...

Can light travel in vacuum ?

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(A ): The light can travel in vacuum but sound cannot do so (R) : Light is an electromagnetic wave and sound is a mechanical wave

Answer the following: Can sound travel in vacuum ?

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

Light waves travel in vacuum along the y-axis. Which of the following may represent the wave front?

Light waves travels in vacuum along the X-axis. Which of the following may represent the wavefronts?

Sound can travel in vacuum.

When light propagates in vacuum there is an electric field and a magnetic field. These fields are

Give the ratio of velocities of two light waves traveling in vacuum and having wavelengths 5000A^@ and 6000A^@ .

Radio waves and visible light in vacuum have

(a) Compare the speed of light of wavelength 4000 Å (i.e., violet light) and 8000 Å (i.e. red light) in vacuum. (b) How is the refractive index of a medium related to the speed of light in it and in vacuum or air ?

ICSE-LIGHT ENERGY-TEST YOURSELF (SHORT/LONG ANSWER TYPE QUESTIONS)
  1. What is irregular reflection ? Give an example.

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  2. How do we see objects around us?

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  3. State two uses of a plane mirror.

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  4. Can light travel in vacuum ?

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  5. The speed of light in air is :

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  6. State the speed of light in glass

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  7. State whether light slows down or speeds up in the following cases : ...

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  8. State whether light slows down or speeds up in the following cases : ...

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  9. State whether light slows down or speeds up in the following cases : ...

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  10. What are primary colours ? Name the three primary colours.

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  11. What are secondary colours ? Name the three secondary colours.

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  12. Fill in the blanks with the appropriate colour : Blue +.............

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  13. Fill in the blanks with the appropriate colour : Red + Blue + .......

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  14. Fill in the blanks with the appropriate colour : Red + Blue = .....

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  15. Fill in the blanks with the appropriate colour : Green + Red = .....

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  16. The leaves appear green when seen in white light. Give a reason.

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  17. A rose appears red in white light. How will it appear in green light ?...

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  18. A rose appears red in white light. How will it appear in red light ? ...

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  19. Why does a piece of paper appear white in sunlight ? How would you exp...

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  20. A piece of paper appears black in sunlight. What will be its colour wh...

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