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When a metal surface is illuminated by a light of wavelength 400nm and 250nm. The maximum velocities of the photo electrons ejected are v and 2v respectively. The work function of the metal is : (h = Planck's constant, c = velocity of light in air )


( A ) 1.5hc×106J
( B ) hc×106J
( C ) 0.5hc×106J
( D ) 2hc×106J

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