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Radiation obtained from hydrogen to form 1st line of Lyman series is made to incident on a photosentive metal of threshold wavelength $2000 A^{0}$ . The maximum kinetic energy of photoelectron emitted from the metal is nearly.

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zero

10.2 eV

6.2 eV

4 eV

answer is D.

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Detailed Solution

$E_{p h} = (13.6 - 3.4) eV = 10.2 eV$

$K E_{max} = E_{p h} - W = 10.2 - (\frac{12400}{2000}) eV = 4 eV$

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