NEET Physics Dual Nature of Radiation and Matter Questions Solved

The maximum velocity of an electron emitted by light of wavelength λ incident on the surface of a metal of work function ϕ is 
(a) 2hc+λϕ1/2        (b) 2hc+λϕ1/2
(c) 2hc-λϕ1/2        (d) 2-ϕm1/2

Where h = Planck's constant, m = mass of electron and c = speed of light.

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