The momentum of a photon in an $X-$ ray beam of ${10^{ - 10}}$ metre wavelength is
The momentum of a photon in an $X-$ ray beam of ${10^{ - 10}}$ metre wavelength is
- A
$1.5 \times {10^{ - 23}}kg - m/sec$
- B
$6.6 \times {10^{ - 24}}kg - m/\sec$
- C
$6.6 \times {10^{ - 44}}kg - m/\sec $
- D
$2.2 \times {10^{ - 52}}kg - m/\sec $
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Monochromatic light of frequency $6.0 \times 10^{14} \;Hz$ is produced by a laser. The power emitted is $2.0 \times 10^{-3} \;W$.
$(a)$ What is the energy of a photon in the light beam?
$(b)$ How many photons per second, on an average, are emitted by the source?
Monochromatic light of frequency $6.0 \times 10^{14} \;Hz$ is produced by a laser. The power emitted is $2.0 \times 10^{-3} \;W$.
$(a)$ What is the energy of a photon in the light beam?
$(b)$ How many photons per second, on an average, are emitted by the source?