Question

The radiation emitted, when an electron jumps from n = 3 to n = 2 orbit is a hydrogen atom, falls on a metal to produce photoelectron. The electrons from the metal surface with maximum kinetic energy are made to move perpendicular to a magnetic field of $\frac{1}{320}$T in a radius of10^–3m. Find the work function of metal-

• A. 1.03 eV
• B. 1.89 eV
• C. 0.86 eV
• D. 2.03 eV

Answer 1

Answer: (C)

0.86 eV

Answer 2

DE = BE of RHS – LHS = (2 × 4 × 7.06) – (7 × 5.6)