Ultraviolet beam of wavelength 280 nm is incident on lithium surface of work function 2.5 eV. The maximum velocity of electron emitted from metal surface is
Sahay Sir > Question Answers > Ultraviolet beam of wavelength 280 nm is incident on lithium surface of work function 2.5 eV. The maximum velocity of electron emitted from metal surface is
A beam of light consists of four wavelength 4000Å, 4800A, 6000A and 7000Å, each of intensity 1.5×10^−3Wm^−2. The beam falls normally on an area 10^−4m^2 of a clean metallic surface of work function 1.9eV. Assuming no loss of light energy (i.e. each capable photon emits one electron) calculate the number of photoelectrons liberated per second.
29
Nov
A beam of light consists of four wavelength 4000Å, 4800A, 6000A and 7000Å, each of intensity 1.5×10^−3Wm^−2. The beam falls normally on an area 10^−4m^2 of a clean metallic surface of work function 1.9eV. Assuming no loss of light energy (i.e. each capable photon emits one electron) calculate the number of photoelectrons liberated per second. [...]
The magnetic field at a point associated with a light wave is B = 2 × 10^−6 Tesla sin[(3.0 × 10^15 s^−1 )t] sin[(6.0 ×10^15 s^−1 )t]. If this light falls on a metal surface having a work function of 2.0eV, what will be the maximum kinetic energy of the photoelectrons ?
29
Nov
The magnetic field at a point associated with a light wave is B = 2 × 10^−6 Tesla sin[(3.0 × 10^15 s^−1 )t] sin[(6.0 ×10^15 s^−1 )t]. If this light falls on a metal surface having a work function of 2.0eV, what will be the maximum kinetic energy of the photoelectrons ? Ultraviolet beam of [...]
In an experiment on photoelectric effect, light of wavelength 800nm ( less than threshold wavelength) is incident on a cesium plate at the rate of 5.0W. The potential of the collector plate is made sufficiently positive with respect to the emitter so that the current reaches its saturation value. Assuming that on the average one of every 10^6 photons is able to eject a photoelectron, find photo current in the circuit.
29
Nov
In an experiment on photoelectric effect, light of wavelength 800nm ( less than threshold wavelength) is incident on a cesium plate at the rate of 5.0W. The potential of the collector plate is made sufficiently positive with respect to the emitter so that the current reaches its saturation value. Assuming that on the average one [...]
Light described at a place by the equation E=(100V/M)×[sin(5×10^15 s^−1)t + sin(8×10^15 s^−1)t] falls on a metal surface having work function 2.0 eV. Calculate the maximum kinetic energy of the photo electrons
29
Nov
Light described at a place by the equation E=(100V/M)×[sin(5×10^15 s^−1)t + sin(8×10^15 s^−1)t] falls on a metal surface having work function 2.0 eV. Calculate the maximum kinetic energy of the photo electrons Ultraviolet beam of wavelength 280 nm is incident on lithium surface of work function 2.5 eV. The maximum velocity of electron emitted from [...]
Two separate monochromatic light beams A and B of the same intensity (energy per unit time) are falling normally on a unit area of a metallic surface. Their wavelength are λA and λB respectively. Assuming that all the the incident light is used in ejecting the photoelectrons, the ratio of the number of photoelectrons from beam A to that from B is
29
Nov
Two separate monochromatic light beams A and B of the same intensity (energy per unit time) are falling normally on a unit area of a metallic surface. Their wavelength are λA and λB respectively. Assuming that all the the incident light is used in ejecting the photoelectrons, the ratio of the number of photoelectrons from [...]
Light of two different frequencies whose photons have energies of 2 eV and 5.0 eV are incident one by one on a metal surface of work function 1.5 eV. The ratio of maximum energies of emitted electrons will be
29
Nov
Light of two different frequencies whose photons have energies of 2 eV and 5.0 eV are incident one by one on a metal surface of work function 1.5 eV. The ratio of maximum energies of emitted electrons will be Ultraviolet beam of wavelength 280 nm is incident on lithium surface of work function 2.5 eV. [...]
If Kinetic energy of the emitted electrons is zero when light of wavelength 686 nm. Then wavelength of radiations emitted by electron having energy 1.81 eV will be. ( Given work function of Cesium = 1.81 eV)
29
Nov
If Kinetic energy of the emitted electrons is zero when light of wavelength 686 nm. Then wavelength of radiations emitted by electron having energy 1.81 eV will be. ( Given work function of Cesium = 1.81 eV) Ultraviolet beam of wavelength 280 nm is incident on lithium surface of work function 2.5 eV. The maximum [...]
Light of wavelength 0.6 mm from a sodium lamp falls on a photocell and causes the emission of photoelectrons for which the stopping potential is 0.5 V. With light of wavelength 0.4 mm from a sodium lamp, the stopping potential is 1.5 V. With this data, the value of h/e is:
29
Nov
Light of wavelength 0.6 mm from a sodium lamp falls on a photocell and causes the emission of photoelectrons for which the stopping potential is 0.5 V. With light of wavelength 0.4 mm from a sodium lamp, the stopping potential is 1.5 V. With this data, the value of h/e is: Ultraviolet beam of wavelength [...]
One milliwatt of light of wavelength 4560 A is incident on a cesium surface of work function 1.9 ev. Given that quantum efficiency of photoelectric emission is 0.5 %. Planck’s constant h = 6.62 × 10^-34 J-s and velocity of light c = 3 × 10^8 ms^-1.
29
Nov
One milliwatt of light of wavelength 4560 A is incident on a cesium surface of work function 1.9 ev. Given that quantum efficiency of photoelectric emission is 0.5 %. Planck’s constant h = 6.62 × 10^-34 J-s and velocity of light c = 3 × 10^8 ms^-1. Ultraviolet beam of wavelength 280 nm is incident [...]
Ultraviolet beam of wavelength 280 nm is incident on lithium surface of work function 2.5 eV. The maximum velocity of electron emitted from metal surface is
29
Nov
Ultraviolet beam of wavelength 280 nm is incident on lithium surface of work function 2.5 eV. The maximum velocity of electron emitted from metal surface is Ultraviolet beam of wavelength 280 nm is incident on lithium surface of work function 2.5 eV. The maximum velocity of electron emitted from metal surface is November 29, 2020 [...]