The dependence of the short wavelength limit ${\mathrm{\lambda }}_{\min }$ on the accelerating potential V is represented by the curve of figure:

1. A
2. B
3. C
4. None of these

The energy that should be added to an electron, to reduce its de-Broglie wavelengths from ${10}^{-10}$ m to 0.5 x ${10}^{-10}$ m, will be

(1) four times the initial energy

(2) thrice the initial energy

(3) equal to the initial energy

(4) twice the initial energy

In a photoelectric effect experiment

1. On increasing intensity and keeping frequency fixed the saturation current decreases

2. On increasing intensity and keeping frequency fixed the saturation current remains constant.

3. On increasing intensity, saturation current may increase.

4. On increasing, frequency saturation current may increase.

When photons of energy hn fall on an aluminium plate (of work function ${\mathrm{E}}_0$), photoelectron on maximum kinetic energy K are ejected. If the frequency of the radiation is doubled, the maximum kinetic energy of the ejected photoelectron will be:-

1. K + ${\mathrm{E}}_0$

2. 2K

3. K

4. K + hn

A particle of mass 3m at rest decays into two particles of masses m and 2m having non-zero velocities. The ratio of the de-Broglie wavelengths of the particles $({\mathrm{\lambda }}_1/{\mathrm{\lambda }}_2)$ is

1. 1/2

2. 1/4

3. 2

4. None of these

Assertion : Photosensitivity of a metal is high if its work function is small.
Reason : Work function = ${\mathrm{hf}}_0$ where ${\mathrm{f}}_0$ is the threshold frequency

Figure represents a graph of kinetic energy (K) of photoelectrons (in eV) and frequency (v) for a metal used as cathode in photoelectric experiment. The work function of metal is

1. 1 eV

2. 1.5 eV

3. 2 eV

4. 3 eV

The value of stopping potential in the following diagram is given by:
    

The stopping potential as a function of the frequency of the incident radiation is plotted for two different photoelectric surfaces \(A\) and \(B\). The graphs demonstrate that \(A\)'s work function is: