Teaching UP PGT Mock Test Series 2024 Physics Atoms De Broglie’s Explanation of Bohr’s Second Postulate of Quantisation
When photon of energy 4.0 eV strikes the surface of a metal A, the ejected photoelectrons have maximum kinetic energy TA eV and de-Broglie wavelength λA. The maximum kinetic energy of photoelectrons liberated from another metal B by photon of energy 4.50 eV is TB = (TA - 1.5) eV. If the de-Broglie wavelength of these photoelectrons λB = 2λA, then the work function of metal B is:
1
1.5 eV
2
4 eV
3
3 eV
4
2 eV