Answer
a) same
b) same
c) increase
d) increase
Work Step by Step
(a) We know that an increase in intensity of the light beam will make more photons incident on the metal surface. However, it doesn't change the kinetic energy of the electron.
(b) The de Broglie wavelength of the electrons depends on the kinetic energy of the electrons but not on the intensity. Thus, the minimum wavelength of the electrons also remains the same.
(c) If the intensity of the light beam is increased, then the number of electrons ejected per second also increases.
(d) We know that electric current is directly proportional to the number of electrons. Thus, the electric current in the phototube increases with the increase of ejected electrons from the metal surface.
