1. Using the experimental apparatus shown in right fig when a UV light with wavelength 1 = 240nm shing a particular metal plate, electrons are emitted from p 1, crossing the gap to plate 2 and causing a current t flow through the wire connecting two plates. The battery voltage is gradually increased until the curre the ammeter drops to zero, at which point the battery voltage is 1.40 V. Ask: a) What is the energy of the photons in the beam of light in eV? b) What is the maximum kinetic energy of the emit c) What is work function of the metal in eV?

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Wien's displacement law

Students often get confused between Wien's displacement law and Planck's radiation law. Although both are historically related, yet they are conceptually different. Planck's law helps determine the spectrum of a blackbody, while Wien's law determines the relationship between peak wavelength and temperature.