Dual Nature of Radiation

The threshold frequency for a metallic surface corresponds to an energy of \(6.2\) \(eV\) and the stopping potential for a radiation incident on this surface is \(5V.\) The incident radiation lies in

The time taken by a photoelectron to come out after the photon strikes is approximately

If the kinetic energy of a free electron doubles, it's deBroglie wavelength changes by the factor

A photocell is illuminated by a small bright source placed \(1\) \(m\) away. When the same source of light is placed \({1 \over 2}\) \(m\) away, the number of electrons emitted by photo-cathode would

The work function of a substance is \(4.0\) \(eV.\) The longest wavelength of light that can cause photo-electron emission from this substance is approximately.

According to Einstein's photoelectric equation, the plot of the kinetic energy of the emitted photo electrons from a metal \(Vs\) the frequency, of the incident radiation gives as straight the whose slope

Two identical photo-cathodes receive light of frequencies \({f_1}\) and \({f_2}\). If the velocities of the photo electrons (of mass \(m\) ) coming out are respectively \({v_1}\) and \({v_2},\) then

Sodium and copper have work functions \(2.3\) \(eV\) and \(4.5\) \(eV\) respectively. Then the ratio of the wavelengths is nearest to

Formation of covalent bonds in compounds exhibits