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JEE Main 2020 (Online) 2nd September Evening Slot
Numerical
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The work function of sodium metal is 4.41 $$ \times $$ 10–19 J. If photons of wavelength 300 nm are incident on the metal, the kinetic energy of the ejected electrons will be (h = 6.63 $$ \times $$ 10–34 J s; c = 3 $$ \times $$ 108 m/s) ________ × 10–21 J.
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