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Ultraviolet rays can NOT pass through...

Ultraviolet rays can NOT pass through

A

quartz

B

fluorite

C

glass

D

rock salt

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CHETANA PUBLICATION-ELECTROMAGNETIC WAVES AND COMMUNICATON SYSTEM-EXERCISE
  1. Electromagnetic waves were first produced in the laboratory by

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  2. The.....% of the solar radians are infrared in nature.

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  3. Ultraviolet rays can NOT pass through

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  4. The air in the stratosphere contains

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  5. Which of the following statements is NOT CORRECT?

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  6. The radio waves reflected from.......are called space wave.

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  7. The special infrared photograph of the body to see diseased parts is c...

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  8. In the diagnosis of superficial tumours and varicose veins which of th...

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  9. The sound waves after being converted into electrical waves are not tr...

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  10. Choose the correct options. Earth's atmosphere is rechest in

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  11. Choose the correct options. A device that converts one form of energ...

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  12. Choose the correct options. Ultraviolet rays can NOT pass through ...

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  13. Choose the correct options. The radio waves from..... are called spa...

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  14. What is modulation?

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  15. Name the most harmful radiation entering the earth's atmosphere from t...

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  16. Does an ordinary electric lamp emit EM waves?

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  17. What are the different types of electro magnetic waves ?

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  18. What is meant by noise?

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  19. Calculate the wavelength in nm of an X-ray wave of frequency 2 xx 10^1...

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  20. In a EM wave the electricfield usallate sinusoidally at a frequency of...

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