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The surface of a metal is illuminated with a light of wavelength 400 nm. The kinetic energy of the ejected photoelectrons was found to be 1.68 eV. The work function of the metal is The surface of a metal is illuminated with a light of wavelength 400 nm. The kinetic energy of the ejected photoelectrons [...]

A cylindrical rod of some laser material 5 * 10^-2 m long and 10^-2 m in diameter contains 2 * 10^25 ions per m^3. If on excitation all the ions are in the upper energy level and A cylindrical rod of some laser material 5 * 10^-2 m long and 10^-2 m in diameter contains [...]

What amount of energy (in eV) should be added to an electron to reduce its de-Broglie wavelength from 100 to 50 pm? What amount of energy (in eV) should be added to an electron to reduce its de-Broglie wavelength from 100 to 50 pm? October 14, 2020 Category: Uncategorised (JEE Advanced Physics by BM Sharma [...]

Calculate de-Broglie wavelength ( in A) for an average helium atom in a furnance at 400 K. Given mass of helium = 4.002 amu. Calculate de-Broglie wavelength ( in A) for an average helium atom in a furnance at 400 K. Given mass of helium = 4.002 amu. October 14, 2020 Category: Uncategorised (JEE Advanced [...]

Light of wavelength 180 nm ejects photoelectrons from a plate of a metal whose work function is 2 eV. If a uniform magnetic field of 5 * 10^-5 T is applied to the plate, what would Light of wavelength 180 nm ejects photoelectrons from a plate of a metal whose work function is 2 eV. [...]

A plane light wave of intensity I = 0.20 W/cm^2 falls on a plane mirror surface with reflection coefficient rho= 0.8. The angle of incidence id 45. In terms of corpuscular theory, A plane light wave of intensity I = 0.20 W/cm^2 falls on a plane mirror surface with reflection coefficient rho= 0.8. The angle [...]

Photons of energy 5 eV are incident on the cathode. Electrons reaching and anode have kinetic energies varying from 6 eV to 8 eV Find the work function of the metal ( in eV). Photons of energy 5 eV are incident on the cathode. Electrons reaching and anode have kinetic energies varying from 6 eV [...]

In figure, electromagnetic radiations of wavelength 200 nm are incident on a metallic plate A. The photoelectrons are accelerated by a potential difference of 10 V. These electrons electromagnetic radiations of wavelength 200 nm are incident on a metallic plate A. The photoelectrons are accelerated by a potential difference of 10 V. These electrons In [...]

An electron of mass m when accelerated through a potential difference V, has a de Broglie wavelength lemda. The de-Broglie wavelength associated with a particle of mass m/4 and charge An electron of mass m when accelerated through a potential difference V has a de Broglie wavelength lemda. The de-Broglie wavelength associated with a particle [...]

In the arrangement shown in figure y = 1.0 mm, d= 0.24 mm and D = 1.2 m. The work function of the material of the emitter is 2.2 eV. Find the stopping potential V needed to stop the photocurrent d= 0.24 mm and D = 1.2 m. The work function of the material of [...]