Physics

Problem

When light of wavelength

4000 \text{ \AA}

is incident on a barium emitter, emitted photo electrons in a transverse magnetic field strength

B = 5.2 \times 10^{-6} \text{ T}

moves in a circular path. Find the radius of the circle. Given work function of barium is

2.5 \text{ eV}

and mass of electron is

9.1 \times 10^{-31} \text{ kg}

e = 1.6 \times 10^{-19} \text{ C}

h = 6.6 \times 10^{-34} \text{ J s}