What is a black body?

  • A
    An ideal body that emits all radiation.
  • B
    An ideal body that absorbs all radiation incident on it.
  • C
    An ideal body that reflects all radiation.
  • D
    An ideal body that transmits all radiation.

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Nitrogen laser produces a radiation at a wavelength of $337.1 \ nm$. If the number of photons emitted is $5.6 \times 10^{24}$,calculate the power of this laser.

The momentum (in $kg \cdot m/s$) of a photon having $6 \, MeV$ energy is:

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