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A photon and an electron have got same d...

A photon and an electron have got same deBroglie wavelenght `(=1^(-10)m)`. Which has greater kinetic energy? Explain.
or Two different radioactive elements with half lives `T_(1)` and `T_(2)` have `N_(1)` and `N_(2)` (undecayed) atoms respectively present at a given instant. Determine the ratio of theri activites at this instant.

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