Dual Nature of Radiation

When a beam of 10.6 eV photons of intensity $2.0 \mathrm{~W} / \mathrm{m}^2$ falls on a platinum surface of area $1.0 \times 10^{-4} \mathrm{~m}^2$ and work function $5.6 \mathrm{eV} .0 .53 \%$ of the incident photons eject photoelectrons. ...

A parallel beam of fast moving electrons is incident normally on a narrow slit. If the speed of the electrons is decreased, the angular width of central maxima

A metal surface is illuminated with photons of energies $E_1=4 \mathrm{eV}$ and $E_2=2.5 \mathrm{eV}$ respectively. The ratio of maximum speeds of the photoelectrons in two cases is 2 .
Work function of metal surface will be

The de-Broglie wavelength of a proton \(\left(m=1.67 \times 10^{-27} \mathrm{~kg}\right)\) acclerated through a potential difference of \(2 \mathrm{~kV}\) is

When \({ }_{92} \mathrm{U}^{235}\) undergoes fission, \(0.1 \%\) of its original mass is changed into energy. How much energy is released if \(5 \mathrm{Kg}\) of \({ }_{92} \mathrm{U}^{235}\) undergoes fission?

Light of wavelength \(\lambda\) strikes a photoelectric surface and electrons are ejected with kinetic energy \(K\). If \(K\) is to be increased to exactly twice its original value, the wavelength must be changed to \(\lambda^{\prime}\), su...

In which of the following photoelectric effect is not observed?

Einstein's photoelectric equation is