Question

the photoelectric thresold wavelength for potassiun having work function of 2eV is​

Answer 1

As we have E = hc/

And E = 2eV

⇒ = hc/E = (6.6 x 10-34 x 3 x 108)/2 x (1.6 x 10-19) = 6.18 x 10-7 m ≈ 620 nm

Answer 2

ANSWER :- 620 nm

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