The momentum of a photon is $2 \times 10^{-16} \text{ g} \cdot \text{cm/s}$. Its energy is:

  • A
    $0.61 \times 10^{-26} \text{ erg}$
  • B
    $2.0 \times 10^{-26} \text{ erg}$
  • C
    $6 \times 10^{-6} \text{ erg}$
  • D
    $6 \times 10^{-8} \text{ erg}$

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The frequency of a photon having energy $100 \ eV$ is $(h = 6.6 \times 10^{-34} \ J \cdot s)$.

$A$ bulb lamp emits light of mean wavelength of $4500 \mathring A$. The lamp is rated at $150 \text{ W}$ and $8 \%$ of the energy appears as emitted light. How many photons are emitted by the lamp per second?

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Write the equation for the energy of a photon.

Which of the following relations is correct for a photon?

An electric bulb of $100 \ W$ power emits photons of wavelength $410 \ nm$ per second. The number of photons emitted per second is: $(h = 6.63 \times 10^{-34} \ J \cdot s, c = 3 \times 10^8 \ m/s)$

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