Questions in Dual Nature of Radiation and Matter

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Light of two different frequencies whose photons have energies $1eV$ and $2.5eV$ respectively, successively illuminates a metal of work function $0.5eV$. The ratio of maximum kinetic energy of the emitted electron will be
Sodium and copper have work functions 2.3$eV$and 4.5$eV$ respectively. Then the ratio of their threshold wavelengths is nearest to
Photon of 5.5 eV energy fall on the surface of the metal emitting photoelectrons of maximum kinetic energy 4.0 eV. The stopping voltage required for these electrons are
A caesium photocell, with a steady potential difference of 60V across, is illuminated by a bright point source of light 50 cm away. When the same light is placed 1m away the photoelectrons emitted from the cell
A radio transmitter radiates 1 kW power at a wavelength 198.6 metres. How many photons does it emit per second
The number of photons of wavelength 540 nm emitted per second by an electric bulb of power 100W is (taking h = $6 \times {10^{ - 34}}\,J{\rm{ - }}sec$)
When radiation is incident on a photoelectron emitter, the stopping potential is found to be 9 volts. If $e/m$ for the electron is $1.8 \times {10^{11}}\,C\,k{g^{ - 1}}$ the maximum velocity of the ejected electrons is
Two identical metal plates show photoelectric effect by a light of wavelength ${\lambda _A}$ falls on plate A and ${\lambda _B}$ on plate B $({\lambda _A} = 2{\lambda _B})$. The maximum kinetic energy is
The threshold wavelength for photoelectric effect of a metal is 6500 Å. The work function of the metal is approximately
When ultraviolet rays are incident on metal plate, then photoelectric effect does not occurs. It occurs by the incidence of

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