NEET 2011 Physics question
An electron in the hydrogen atom jumps from excited state to the ground state. The wavelength so emitted illuminates a photosensitive material having work function . If the stopping potential of the photoelectron is , the value of is :
Answer: (2)
Solution
The maximum kinetic energy of the photoelectrons is . By Einstein's equation the photon energy is . This photon energy equals the energy difference in the hydrogen transition : $13.6(1 -
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