JEE Main | 2014Photoelectric EffectHard
Question
The radiation corresponding to 3 → 2 transition of hydrogen atoms falls on a metal surface to produce photoelectrons. These electrons are made to enter a magnetic field of 3 × 10-4 T. If the radius of the largest circular path followed by these electrons is 10.0 mm, the work function of the metal is close to
Options
A.1.8 eV
B.1.1 eV
C.0.8 eV
D.1.6 eV
Solution
r 
=
⇒ V =
= 0.8 V
For transition between 3 to 2,
E = 13.6
1.88 eV
Work function = 1.88 eV - 0.8 eV
= 1.08 eV = 1.1 eV
=
⇒ V =
= 0.8 V For transition between 3 to 2,
E = 13.6
1.88 eV Work function = 1.88 eV - 0.8 eV
= 1.08 eV = 1.1 eV
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