Ultraviolet light of wavelength 280 nm is incident
on a lithium cathode of work function 2.5 eV.
Take the value of the Planck constant h as 6.63 x
10-34 J.s and the speed of light cas
3 x 108 m/s. The stopping potential is
1.94 V
1.34 V
1.54 V
1.74 V
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