A $100\,watt$ light source is emitting radiations of wavelength $5000\,\mathop A\limits^o $. The rate of emission of photons is of the order of

  • A

    $10^{40}$

  • B

    $10^{20}$

  • C

    $10^{10}$

  • D

    $10^{5}$

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