A point source of light is used in an experiment on photoelectric effects. Which of the following curves best represents the variation of photocurrent \((i)\) with distance \((d)\) of the source from the emitter?

   

1.	\(a\)	2.	\(b\)
3.	\(c\)	4.	\(d\)

The stopping potential \((V_{0})\) versus frequency \((\nu_{0})\) plot of a substance is shown in the figure. What will be the threshold wavelength?    
         

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 graph that correctly represents the relation of frequency v of a particular characteristic X-ray with the atomic number Z of the material is

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 curves (a), (b) (c) and (d) show the variation between the applied potential difference (V) and the photoelectric current (i), at two different intensities of light ( ${\mathrm{I}}_1>{\mathrm{I}}_2$). In which figure is the correct variation shown ?

Assertion : The energy (E) and momentum (p) of a photon are related by p=E/c .
Reason : The photon behaves like a particle.

Assertion : Photoelectric effect demonstrates the wave nature of light.
Reason : The number of photoelectrons is proportional to the frequency of light.

Assertion : When the speed of an electron increases its specific charge decreases.
Reason : Specific charge is the ratio of the charge to mass.

Assertion : Mass of moving photon varies inversely as the wavelength.
Reason : Energy of the particle  = Mass$\times {\left(\mathrm{speed} \mathrm{of} \mathrm{light}\right)}^2$