The radiation corresponding to 3—>2 transition of hydrogen atom falls on a metal surface to produce photoelectrons . these electrons are made to entre a magnetic field of 3× 10⁻⁴T . if the radius of the largest circular path followed by these electrons is 10.0mm , The work function of the metal is close to [JEE main 2014]
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Answer:
The work function of the metal is close to 1.1ev
Explanation:
Given :-transition of hydrogen atom 3—>2
Magnetic field B = 3× 10⁻⁴T
Radius of path is 10mm = 10× 10⁻³m
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When an electron moves in a circular path , then
Radius ,r = mv/qB ⇒ mv = rqB___(1)
Work function of the metal (W) ,
Work function of metal = 1.1 ev .