The spectrum of radiation $1.0 \times {10^{14}}Hz$ is in the infrared region. The energy of one photon of this in joules will be
$6.62 \times {10^{ - 48}}$
$6.62 \times {10^{ - 20}}$
$\frac{{6.62}}{3} \times {10^{ - 28}}$
$3 \times 6.62 \times {10^{ - 28}}$
What is the energy of photon whose wavelength is $6840\,\mathop A\limits^o $ ?......$eV$
In photoelectric effect, the K.E. of electrons emitted from the metal surface depends upon
A $160 \,W$ light source is radiating light of wavelength $6200 \,\mathring A$ uniformly in all directions. The photon flux at a distance of $1.8 \,m$ is of the order of .......... $m ^{-2} s ^{-1}$ (Planck's constant $\left.=6.63 \times 10^{-34} \,J - s \right)$