The momentum of the photon of wavelength $5000\,\mathring A$ will be
$1.3 \times {10^{ - 27}}kg{\rm{ - }}$m/sec
$1.3 \times {10^{ - 28}}kg{\rm{ - }}$m/sec
$4 \times {10^{29}}kg{\rm{ - }}$m/sec
$4 \times {10^{ - 18}}kg{\rm{ - }}$m/sec
Energy conversion in a photoelectric cell takes place from
The energy of a photon is $E = hv$ and the momentum of photon $p = \frac{h}{\lambda }$, then the velocity of photon will be
According to photon theory of light which of the following physical quantities associated with a photon do not/does not change as it collides with an electron in vacuum
If $2.5 \times 10^{-6\,} N$ average force is exerted by a light wave on a non-reflecting surface of $30\, cm ^{2}$ area during $40$ minutes of time span, the energy flux of light just before it falls on the surface is .................. $W / cm ^{2}$
(Round off to the Nearest Integer)
(Assume complete absorption and normal incidence conditions are there)