Dual Nature of Matter and Radiation

Two metals A and B have work functions
2 eV and 5 eV respectively. Which metal has
lower threshold wavelength ? [AI 2004

With what purpose was famous Davisson-
Germer experiment with electrons performed ?
[Delhi 2006]

How will the photoelectric current change on
decreasing the wavelength of incident
radiation for a given photosensitive material ?
[Delhi 2006C]

If the intensity of the incident radiation on a
photosensitive surface is doubled, how does the
kinetic energy of the emitted electrons get
affected ? [Foreign 2005

Define work function for a given metallic
surface. [Delhi 2004C

Two beams, one of red light and the other of
blue light, of the same intensity are incident on
a metallic surface to emit photoelectrons.
Which one of the two beams emits electrons of
greater kinetic energy ? [Delhi 2004C]