A metal whose work function is 3.3 eV is illuminated by light ofwavelength . What is the threshold frequency for photoelectric emission? Planck’s constant = .
Therefore, the threshold frequency is
In Millikan’s oil drop experiment, a charged oil drop of mass is held stationary between two parallel plates 6 mm apart by applying a potential difference of 1200 V between them. How many excess electrons does the oil drop carry? Take g = 10 ms–2.
In Millikan’s oil drop experiment, an oil drop carrying a charge q falls with a terminal velocity v0 when there is no electric field between the plates. An electric field E is applied to keep it stationary. What additional charge should the oil drop acquire so that it begins to move upwards with a velocity 2v0 in the same electric field?
A metal whose work function is 3.31 eV is illuminated by light ofwavelength . What is the threshold frequency for photoelectric emission? Take
What is the maximum energy of photoelectrons emitted from the metal.
The photoelectric threshold for a certain metal surface is 330 Å. What is the maximum kinetic energy of photoelectron released, if any, by a radiation of wavelength 1100 Å ?
When a point source of light is at a distance of 50 cm from a photoelectric cell, the cut-off voltage is found to be V0. If the same source is placed at a distance of 1 m from the cell, the cut-off voltage will be
No photoelectrons are emitted from a metal if the wavelength of light exceeds 6000 Å. The work function of the metal is approximately equal to
The threshold wavelength for photoelectric emission from a material is 5200 Å. photoelectrons will be emitted when this material is illuminated with monochromatic radiation from a
The wavelength in air associated with a photon of energy E is (c is the speed of light in air and h is the Planck’s constant)
In X-ray tube produces a continuous spectrum of radiation with its short-wavelength end at 0.33 Å. What is the maximum energy of a photon in the radiation? Planck’s constant .