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Some scientists have predicted the globa...

Some scientists have predicted the global nuclear war on the earth would be followed by a serve nuclear winter with a devastating effect on life on earth.What might be the basis of this prediction?

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Nuclear radioactive waste will hang like a cloud in the earth atmosphere and will absorb sun radiations.
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Answer the following questions: (a) Long distance radio broadcasts use short-wave bands. Why? (b) It is necessary to use satellites for long distance TV transmission. Why? (c) Optical and radiotelescopes are built on the ground but X-ray astronomy is possible only from satellites orbiting the earth. Why? (d) The small ozone layer on top of the stratosphere is crucial for human survival. Why? (e) If the earth did not have an atmosphere, would its average surface temperature be higher or lower than what it is now? (f) Some scientists have predicted that a global nuclear war on the earth would be followed by a severe ‘nuclear winter’ with a devastating effect on life on earth. What might be the basis of this prediction? Answer the following questions: (a) Long distance radio broadcasts use short-wave bands. Why? (b) It is necessary to use satellites for long distance TV transmission. Why? (c) Optical and radiotelescopes are built on the ground but X-ray astronomy is possible only from satellites orbiting the earth. Why? (d) The small ozone layer on top of the stratosphere is crucial for human survival. Why? (e) If the earth did not have an atmosphere, would its average surface temperature be higher or lower than what it is now? (f) Some scientists have predicted that a global nuclear war on the earth would be followed by a severe ‘nuclear winter’ with a devastating effect on life on earth. What might be the basis of this prediction?

A : It has been predicted that a global nuclear war on the earth would be followed by a severe 'nuclear winter' with a devastating effect on life on earth. R : The clouds produced by global nuclear war would perhaps cover substantial parts of the sky preventing solar light from reaching many parts of the globe causing winter.

Our atmosphere is getting hotter, more turbulent, and more unpredictable because of the ''boiling and churning'' effect caused by the heat-trapping greenhouse gases within the upper layers of atmosphere. With increase of carbon, methane, or other greenhouse gas levels in the atmosphere, our local weather and global climate is further agitated, heated, and ''boiled''. The green house gases such as water vapour, carbon dioxide methane, nitrous oxied, and ozone are causing great impact on life on earth. Due to global warming, the glaciers are melting, causing sea level rise, coastal submergence and frequent natureal disasters. We have to rethink while taking the development projects and help to protect the existing life forms on the earth before its too late because climate change can exetrminate us. What is the chain of impacts caused due to global warming?

Our atmosphere is getting hotter, more turbulent, and more unpredictable because of the ''boiling and churning'' effect caused by the heat-trapping greenhouse gases within the upper layers of atmosphere. With increase of carbon, methane, or other greenhouse gas levels in the atmosphere, our local weather and global climate is further agitated, heated, and ''boiled''. The green house gases such as water vapour, carbon dioxide methane, nitrous oxied, and ozone are causing great impact on life on earth. Due to global warming, the glaciers are melting, causing sea level rise, coastal submergence and frequent natureal disasters. We have to rethink while taking the development projects and help to protect the existing life forms on the earth before its too late because climate change can exetrminate us. Why is life thereatened on the earth due to global warming?

If the atmosphere suddenly condensed into a solid mass and formed a thin layer on the siuface of the earth,what effect would it have on the time of rotation of the earth about it

CBSE COMPLEMENTARY MATERIAL-DUAL NATURE OF MATTER AND RADIATION & ATOMS AND NUCLEI-VERY SHORT ANSWER QUESTIONS (2 mark)
  1. Which of the following radiations alpha,beta and gamma are : travel...

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  2. Which of the following radiations alpha,beta and gamma are : simila...

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  3. Some scientists have predicted the global nuclear war on the earth wou...

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  4. If the total number of neutrons and protons in a nuclear reaction is c...

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  5. In the ground state of hydrogen atom orbital radius is 5.3 xx 10^(-11...

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  6. Calculate the percentage of any radioactive substance left undecayed a...

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  7. Why is the density of the nucleus more than that of atom ?

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  8. The atom ""8O^(16) has 8 protons 8 neutrons and 8 electrons while atom...

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  9. What is the effect on neutron to proton ratio in a nucleus when beta^(...

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  10. Why must heavy stable nucleus contain more neutrons than protons ?

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  11. Show that the decay rate R of a sample of radionuclide is related to t...

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  12. What is a nuclear fusion reaction ? Why is nuclear fusion difficult to...

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  13. Write two characteristic features of nuclear forces which distinguish ...

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  14. Half life of certain radioactive nuclei is 3 days and its activity is ...

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  15. Derive mvr=(nh)/(2pi) using de-Broglie equation.

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  16. Draw graph of number of scattered particles to scattering angle in Rat...

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  17. If the energy of a photon is 25 eV and work function of the material i...

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  18. What is the shortest wavelength present in the (i) Paschen series (ii)...

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  19. The radius of innermost electron orbit of a hydrogen atom is 5.3xx10^(...

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  20. The ground state energy of hydrogen atom is -13.6 eV. What are the kin...

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