Photoelectric Effect Questions

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 a straight line whose slope:

The work function of a substance is $4.0\text{eV}$. Then the longest wavelength of light that can cause photoelectron emission from this substance is approximately:

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

The threshold frequency for a metallic surface corresponds to an energy of $6.2\text{eV}$, and the stopping potential for a radiation incident on this surface is $5\text{V}$. The incident radiation lies in the:

The anode voltage of a photocell is kept fixed. The wavelength $\lambda$ of the light falling on the cathode is gradually changed. The plate current $I$ of the photocell varies as follows:

A photocell is illuminated by a small bright source placed $1\text{ m}$ away. When the same source of light is placed $1/2\text{ m}$ away, the number of electrons emitted by photo cathode would:

Two identical photo cathodes receive light of frequencies $f_1$ and $f_2$. If the velocities of the photoelectrons (of mass $m$) coming out are respectively $v_1$ and $v_2$, then:

The surface of a metal is illuminated with the light of $400\text{nm}$. The kinetic energy of the ejected photoelectrons was found to be $1.68\text{eV}$. The work function of the metal is ($hc=1240\text{eV nm}$):

Statement-1: When ultraviolet light is incident on a photocell, its stopping potential is $V_0$ and the maximum kinetic energy of the photoelectrons is $K_{max}$. When the ultraviolet light is replaced by X-rays, both $V_0$ and $K_{max}$ increase.Statement-2: Photoelectrons are emitted with speeds ranging from zero to a maximum value because of the range of frequencies present in the incident light.

Statement-1 : A metallic surface is irradiated by a monochromatic light of frequency $\nu >{\nu }_0$ (the threshold frequency). The maximum kinetic energy and the stopping potential are $K_{max}$ and $V_0$ respectively. If the frequency incident on the surface is doubled, both the $K_{max}$ and $V_0$ are also doubled.Statement-2 : The maximum kinetic energy and the stopping potential of photoelectrons emitted from a surface are linearly dependent on the frequency of incident light.