List of top Physics Questions on Photoelectric Effect asked in MHT CET

Determine the energy of a photon in eV if its wavelength is \( 4000\ \text{\AA} \).
The maximum velocity of the photoelectrons emitted by a metal surface is $9 \times 10^5 \text{ m/s}$. The value of ratio of charge (e) to mass (m) of the photoelectron is $1.8 \times 10^{11} \text{ C/kg}$. The value of stopping potential in volt is
Energy of the incident photons on the metal surface is initially \(4 \text{ W}\) and then \(6 \text{ W}\) where \(W\) is the work function of that metal. The ratio of velocities of emitted photoelectrons is
A photosensitive surface has work function (\phi). If photon of energy (3\phi) falls on this surface, the electron comes out with maximum velocity of (4 \times 10^6 m/s). When photon energy is increased to (7\phi) then maximum velocity will be
Light of wavelength ' $\lambda$ ' falls on a metal having work function $\frac{\text{hc}{\lambda_0}$. Photoelectric effect will take place only if ( $\lambda_0$ is the threshold wavelength)}
From photoelectric effect experiment, select the correct statement.
When a photosensitive metal surface is illuminated with radiation of wavelength ' $\lambda_1$ ', the stopping potential is ' $V_1$ '. If the same surface is illuminated with radiation of wavelength ' $3\lambda_1$ ', the stopping potential is $\frac{V_1}{6}$. The threshold wavelength for the photosensitive metal surface is
Energy of the incident photons on the metal surface is initially \(4 \text{ W}\) and then \(6 \text{ W}\) where \(W\) is the work function of that metal. The ratio of velocities of emitted photoelectrons is
A photosensitive surface has work function (\phi). If photon of energy (3\phi) falls on this surface, the electron comes out with maximum velocity of (4 \times 10^6 m/s). When photon energy is increased to (7\phi) then maximum velocity will be
The maximum velocity of the photoelectrons emitted by a metal surface is $9 \times 10^5 \text{ m/s}$. The value of ratio of charge (e) to mass (m) of the photoelectron is $1.8 \times 10^{11} \text{ C/kg}$. The value of stopping potential in volt is
A metal surface is illuminated by light of two different wavelengths \(207\text{ nm}\) and \(414\text{ nm}\) . The maximum speeds of photoelectrons corresponding to these wavelengths are \(u_1\) and \(u_2\) respectively with \(u_1 : u_2 = 2 : 1\). The work function of the metal is (\(hc = 1242\text{ eV nm}\))
The maximum kinetic energy of the photoelectrons varies.
The difference between threshold wavelengths for two metal surfaces \( A \) and \( B \) having work functions \( \phi_A = 9 \, \text{eV} \) and \( \phi_B = 4.5 \, \text{eV} \) is: \[ \text{(Given: } h c = 1242 \, \text{eV nm)} \]
When wavelength of incident radiation on the metal surface is reduced from $\lambda_1$ to $\lambda_2$, the kinetic energy of emitted photoelectrons is tripled. The work function of metal [$h$ = Planck's constant, $c$ = velocity of light] is
In photoelectric effect, the photo current
In a photoelectric experiment, keeping the frequency of incident radiation and accelerating potential fixed, if the intensity of incident light is increased, then the
On a photosensitive surface, if the intensity of incident radiation is increased, the stopping potential
Light of frequency two times the threshold frequency is incident on photosensitive material. If the incident frequency is made 1/3 rd and intensity is doubled, then the photoelectric current will
Photoemission from a metal surface takes place for frequencies $\nu_1$ and $\nu_2$ of incident rays ($\nu_1 > \nu_2$). The maximum kinetic energy of the photoelectrons emitted is in the ratio $1 : K$. The threshold frequency ($\nu_0$) of the metallic surface is
Photoelectrons are emitted when photons of energy $4.2\ \text{eV}$ are incident on a photosensitive metallic sphere of radius $10\ \text{cm}$ and work function $2.4\ \text{eV}$. The number of photoelectrons emitted before the emission is stopped is
[$\frac{1}{4\pi\epsilon_0} = 9 \times 10^9\ \text{SI unit};\ e = 1.6 \times 10^{-19}\ \text{C}$]
When a photosensitive surface is irradiated by light of wavelengths '$\lambda_1$' and '$\lambda_2$', kinetic energies of emitted photoelectrons are '$E_1$' and '$E_2$' respectively. The work function of the photosensitive surface is
When light of wavelength '$\lambda$' is incident on a photosensitive surface, photons of power 'P' are emitted. The number of photon 'n' emitted in time 't' is [h = Planck's constant, c = velocity of light in vacuum]
On a photosensitive surface, if the intensity of incident radiation is increased, the stopping potential
Light of frequency two times the threshold frequency is incident on photosensitive material. If the incident frequency is made 1/3 rd and intensity is doubled, then the photoelectric current will
A metal surface is illuminated by light of two different wavelengths \(207\text{ nm}\) and \(414\text{ nm}\) . The maximum speeds of photoelectrons corresponding to these wavelengths are \(u_1\) and \(u_2\) respectively with \(u_1 : u_2 = 2 : 1\). The work function of the metal is (\(hc = 1242\text{ eV nm}\))