Question

Light of wavelength $2475\mathring{A}$ is incident on barium. Photo electrons emitted describe a circle of radius $100cm$ by a magnetic field of flux density $\frac{1}{\sqrt{17}}\times {10}^{-5}$ Tesla.Work function of the barium is (Given $\frac{e}{m}=1.7\times {10}^{11})$

• A. $1.8eV$
• B. $2.1eV$
• C. $4.5eV$
• D. $3.3eV$

Answer 1

Answer: (C)