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प्रश्न
What do you mean by background radiations?
एका वाक्यात उत्तर
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उत्तर १
The low temperature microwave radiation that arrives at the earth's surface from all directions of outer space is called background radiation.
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उत्तर २
Background radiation are the radioactive radiations to which we all are exposed, even in the absence of an actual visible radioactive source.
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