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Ultraviolet light of wavelenght 280 nm i...

Ultraviolet light of wavelenght 280 nm is used in an experiment on photo electric effect with lithium `(phi=2.5eV)` cathode.
(1) The maximum kinetic energy is 1.9eV
(2) The stopping potential is 1.9V
(3) The maximum kinetic energy is 4.4 V
(4) The stopping potential is 4.4. eV

A

1,2 and 3 are correct

B

1 and 2 are correct

C

2 and 4 are correct

D

1 and 3 are correct

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