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electrons are emitted with zero velocity from a certain metal surface when it is exposed to radiations of wavelength 7000 A0 . The work function of the metal is ?
c = νλ∴ νo = c/λo = 3.0×108 ms-1/7000×10-10 m = 4.29×1014 s-1Work function (wo) = hνo = 6.626×10-34 Js×4.29×1014 s-1 = 2.842×10-19 J
E=hc/lambda. also E=hvoC/lambda= vo3 x 10^8 / 7000 x 10^-10 . ( 1 A = 10-10)vo = 4.281 x 10^14 s^-1w0 = hv0 = 6.63* 10^-34 * 4.28*10^14=> 28.41 *10^-20 J
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