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Which of the following statements is NOT...

Which of the following statements is NOT CORRECT?

A

Infrared rays are invisible but can cast shadows like visible light

B

Photographic plates are sensitive to ultraviolet rays

C

Photographic plates are sensitive to X-rays.

D

Infrared photons have more energy than photons of visible light

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CHETANA PUBLICATION-ELECTROMAGNETIC WAVES AND COMMUNICATON SYSTEM-EXERCISE
  1. Ultraviolet rays can NOT pass through

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  2. The air in the stratosphere contains

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  3. Which of the following statements is NOT CORRECT?

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

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

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

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

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

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

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

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

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  12. What is modulation?

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

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  14. Does an ordinary electric lamp emit EM waves?

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

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  16. What is meant by noise?

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

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

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  19. Give reason for the following, satellite are used for long distance TV...

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  20. What are radio waves? Give its two uses

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