Question
Half life of radioactive element depends upon:

Answer

  1. Nature of element.

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A plane electromagnetic wave is incident on a material surface. The wave delivers momentum p and energy E.
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  2. $\text{p}\neq0,\text{ E}=0$
  3. $\text{p}\neq0,\text{ E}\neq0$
  4. $\text{p}=0,\text{ E}=0$
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