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A : If the earth did not have an atmosph...

A : If the earth did not have an atmosphere, its average surface temperature would have been lower.
R : In the absence of atmosphere, the green house effect will be absent.

A

the same

B

less than the present

C

more than the present

D

`- 273^(@)`C (considering the absorption of EM waves by ozone layer)

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The correct Answer is:
B
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AAKASH SERIES-ELECTROMAGNETIC WAVES-EXERCISE -IA
  1. Assume that a lamp radiates power P uniformly in all directions. The m...

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  2. When a low flying aeroplane passes over head, we sometimes notice a sl...

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  3. A : If the earth did not have an atmosphere, its average surface temp...

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  4. Ozone layer protestes the living cells from

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  5. Ozone layer blocks the radiations of wave length: (1.) less than 3 × ...

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  6. Practically ozone layer absorbs the radiation of wavelength

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  7. A radiation of energy E falls normally on a perfectly reflecting surfa...

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  8. The type of electromagnetic wave propagation which is effected as a re...

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  9. X-rays are known as to be electromagnetic radi­ation. Therefore the X-...

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  10. The altitude of the ozone layer in the atmosphere and the ‘type’ of th...

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  11. Four atmospheric layers are given below, namely (i) stratosphere (ii) ...

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  12. Infrared radiations are detected by

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  13. Finger prints on a piece of paper may be detected by sprinkling fluore...

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  14. The atmosphere above the height of 80 km is called

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  15. The frequency from 3Hz to 30MHz is known as

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  16. The frequency from 3xx10^(9) Hz to 3xx10^(10) Hz is

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  17. A cube of edge a has its edges parallel to X, Y and Z -axis of rectang...

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  18. Green house effect is

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  19. One requires 11eV of energy to dissociate a carbon monoxide molecule i...

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  20. The ratio of contributions made by the electric field and magnetic fie...

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