If `lamda_o and lamda` be the threshold wavelength and wavelength of incident light , the velocity of photoelectron ejected from the metal surface is :
Two photons of energy 2.5 eV and 3.5 eV fall on a metal surface on work function 1.5 eV. The ratio of the maxium velocities of the photoelectrons emitted from the metal surface is
The threshold wavelength for a certain metal is 2000 Å. The work function of the is
A monochromatic light of wavelength lamda is incident on an isolated metallic sphere of radius a. The threshold wavelength is lamda_(0) , which is larger than lamda . Find the number of photoelectrons emitted before the emission of photo electrons stops.
The threshold wavelength for certain metal is lambda _(0) . When a light of wavelength (lambda_(0))//(2) is incident on it , the mximum velocity of photelectrons is 10^(6) m//s . If the wavelength of the incident radiation is reduced to (lambda _(0) // (5) , then the maximum velocity of the photoelectrons in m//s will be ,
Consider the two following A and B and identify the correct choice given in the answers. A In the photovoltaic cells the photoelectric current produced is not proportional to the intensity of incident light . B In gas filled photoemissive cells ,the velocity of photoelectrons depends on the wavelength of the incident radiation.
The work function of caesium is 2.14 ev. Find (a) the threshold frequency for caesium, and (b) the wavelength of the incident light if the photocurrent is brought to zero by a stopping potential of 0.60 V.
The work function of caesium is 2.14 eV . Find (a) the threshold frequency for caesium , and ( b) the wavelength of the incident light if the photocurrent is brought to zero by a stopping potential of 0.60 V.
A small metal plate (work function W) is kept at a distance d from a singly ionized, fixed ion. A monochromatic light beam is incident on the metal plate and photoelectrons re emitted. Find the maximum wavelength of the light beam so that some of the photoelectrons may go round the ion along a circle.
