Photoelectric Effect Questions

Which of the following options represents the variation of photoelectric current with intensity and frequency of light shown on the x-axis?

The work functions for metals A, B and C are respectively 1.92 eV, 2.0 eV and 5 eV. According to Einstein's equation, the metals which will emit photoelectrons for a radiation of wavelength 4100 Å is/are :

In photoelectric emission process from a metal of work function $1.8\text{eV}$, the kinetic energy of most energetic electrons is $0.5\text{eV}$. The corresponding stopping potential is:

Photoelectric emission occurs only when the incident light has more than a certain minimum:

Light of two different frequencies whose photons have energies $1\text{eV}$ and $2.5\text{eV}$ respectively illuminate a metallic surface whose work function is $0.5\text{eV}$ successively. The ratio of maximum speeds of emitted electrons will be:

The number of photo electrons emitted for light of a frequency $\nu$ (higher than the threshold frequency ${\nu }_0$) is proportional to:

The Figure shows a plot of photo current versus anode potential for a photo sensitive surface for three different radiations. Which one of the following is a correct statement?

A source $S_1$ is producing $10^{15}\text{ photons per second}$ of wavelength $5000\text{ A˚}$. Another source $S_2$ is producing $1.02\times 10^{15}\text{ photons per second}$ of wavelength $5100\text{ A˚}$. Then (power of $S_2$)/(power of $S_1$) is equal to:

The potential difference that must be applied to stop the fastest photo electrons emitted by a nickel surface, having work function $5.01\text{ eV}$, when ultraviolet light of $200\text{ nm}$ falls on it, must be:

Threshold frequency for a metal is $3.3\times 10^{14}\text{Hz}$. If light of frequency $8.2\times 10^{14}\text{Hz}$ is incident, the cut-off voltage is nearly:

The work function of a surface of a photosensitive material is $6.2\text{eV}$. The wavelength of the incident radiation for which the stopping potential is $5\text{V}$ lies in the:

A $5\text{W}$ source emits monochromatic light of wavelength $5000\text{A˚}$. When placed $0.5\text{m}$ away, it liberates photoelectrons from a photosensitive metallic surface. When the source is moved to a distance of $1.0\text{m}$, the number of photoelectrons liberated, will be reduced by a factor of:

A photosensitive metallic surface has work function, hv0. If photons of energy 2hv0 fall on this surface, the electrons come out with a maximum velocity of 4 x 106 m/s. When the photon energy is increased to 5hv0, then maximum velocity of photoelectrons will be :

Two radiations of photon energies $1\text{eV}$ and $2.5\text{eV}$ illuminate a surface of work function $0.5\text{eV}$ successively. The ratio of the maximum speeds of the emitted electrons is:

Monochromatic radiation emitted when electron on hydrogen atom jumps from first excited to the ground state irradiates a photosensitive material. The stopping potential is measured to be $3.57\text{V}$. The threshold frequency of the material is:

For photoelectric emission, the cutoff frequency is $\nu$. If radiation of frequency $2\nu$ impinges on the plate, the maximum velocity of emitted electrons is:

When the energy of the incident radiation is increased by $20\%$, the kinetic energy of the photoelectrons emitted from a metal surface increased from $0.5\text{eV}$ to $0.8\text{eV}$. The work function of the metal is:

Light of wavelength $500\text{nm}$ is incident on a metal with work function $2.28\text{eV}$. The de Broglie wavelength of the emitted electron is:

A photoelectric surface is illuminated successively by monochromatic light of wavelength $\lambda$ and $\frac{\lambda }{2}$. If the maximum kinetic energy of the emitted photoelectrons in the second case is $3$ times that in the first case, the work function of the surface of the material is:

When a metallic surface is illuminated with radiation of wavelength $\lambda$, the stopping potential is $V$. If the same surface is illuminated with radiation of wavelength $2\lambda$, the stopping potential is $V/4$. The threshold wavelength for the metallic surface is:

Photons with energy $5\text{eV}$ are incident on a cathode $C$ in a photoelectric cell. The maximum energy of emitted photoelectrons is $2\text{eV}$. When photons of energy $6\text{eV}$ are incident on $C$, no photoelectrons will reach the anode $A$, if the stopping potential of $A$ relative to $C$ is: