In photoelectric effect, the kinetic energy of photoelectrons increases linearly with the

1.  Wavelength of incident light

2.  Frequency of incident light

3.  Velocity of incident light

4.  Atomic mass of an element

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 photoelectric emission from a surface starts only when the light incident upon the surface has a certain minimum:

1.  Intensity

2.  Wavelength

3.  Frequency

4.  Velocity

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 × ${10}^{-19}$ eV
4.  5.84 × 10⁵ eV

The work function for the Cesium atom is 1.9 eV. The threshold frequency of the radiation is

1. 4.59 × 10¹⁴ ${\mathrm{s}}^{-1}$

2. 8.59 × 10¹⁴ ${\mathrm{s}}^{-1}$

3. 5.59 × 10^-14 ${\mathrm{s}}^{-1}$

4. 65.9 × 10¹⁴ ${\mathrm{s}}^{-1}$

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

A photon with an initial frequency of ${10}^{11}$ Hz scatters off an electron at rest. Its final frequency is $0.9 \times {10}^{11}$ Hz. The speed of scattered electron is close to 

$$\begin{gathered} 1. 3 \times {10}^2 {\mathrm{ms}}^{-1} \\ 2. 3.8 \times {10}^{3 }{\mathrm{ms}}^{-1} \\ 3. 2 \times {10}^6 {\mathrm{ms}}^{-1} \\ 4. 30 {\mathrm{ms}}^{-1} \end{gathered}$$ 

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

The ratio of slopes of ${\mathrm{K}}_{\max } \mathrm{vs}. \mathrm{v} \mathrm{and} {\mathrm{V}}_0 \mathrm{vs}. \mathrm{v}$ curves in photoelectric effect gives -

(v=frequency, ${\mathrm{K}}_{\max }$=maximum kinetic energy, ${\mathrm{V}}_0$ stopping potential):

1.  Charge of electron

2.  Planck's constant

3.  Work function

4.  The ratio of Planck's constant of electronic charge