Answers

2015-02-13T10:33:40+05:30
Radiation is the transfer of energy without the involvement of any medium.       Eg.-1>Radiation of heat and light energy from Sun
       2> Radiation from Radioactive substances
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2015-02-13T19:17:07+05:30
Radiation is the process of transfer of heat without any medium. So, it can be observed even in vacuum.
EXAMPLES:-
1) Process of rays of sun reaching the earth
2) Ultraviolet radiation
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