Electrons are emitted with zero velocity from a metal surface when it is exposed to radiation of
wavelength 6800 Å. The work function (W0 ) of the metal is:
1. 3.109 x 10-20 J
2. 2.922 x 10-19 J
3. 4.031 x 1019 J
4. 2.319 x 10-18 J
The ejection of the photoelectron from the silver metal can be stopped by applying a voltage of 0.35 eV when the radiation having a wavelength of 256.7 nm is used. The work function for silver metal is:
1. 3.40 eV
2. 5.18 eV
3. 4.48 eV
4. -4.40 eV
A photon of wavelength 4 × 10–7 m strikes a metal surface, the work function of the metal being 2.13 eV. The kinetic energy of emission would be:
1. 0.97 eV
2. 97 eV
3. 4.97 × eV
4. 5.84 × 105 eV
The work function for the Cesium atom is \(1.9~\mathrm{eV}.\) The threshold frequency of the radiation is:
1. | \(4.59 \times10^{14}~s^{-1}\) | 2. | \(8.59 \times10^{14}~s^{-1}\) |
3. | \(5.59 \times10^{-14}~s^{-1}\) | 4. | \(65.9 \times10^{14}~s^{-1}\) |
When a photon with a wavelength of 150 pm strikes an atom, one of its inner bound electrons is ejected at a velocity of 1.5 × 107 m s–1 . The energy with which it is bound to the nucleus would be:
1. 32.22 × 10–16 J
2. 12.22 × 10–16 J
3. 22.27 × 10–16 J
4. 31.22 × 10–16 J