The photoelectric effect Experimental facts Heinrich Hertz found out experimentally that, electrons were ejected from metallic surface when light is incident on it. The variation of current versus potential difference, V is given by, There is a stopping potential $V_o$ for which no current flows. As V increases current soon reaches a saturation value. For […]
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Wein’s Displacement Law The law states that the wavelength where the energy density is maximum. λmax and product of the T is a constant $$λ_{max} T = 0.289 cm^1K$$ To find the maximum of u (v, T) $$frac{du}{dv}=frac{8pi h}{c^3}left[frac{v^3}{e^{displaystylefrac{hnu}{kT}}-1}right]$$ For u to be maximum $frac{du}{dv}=0$ The above equation becomes So, $$3nu^2left(e^frac{hnu}{kT}-1right)=nu^3frac h{kT}e^frac{hnu}{kT}$$ Let $$ frac{hnu}{kT}=frac{hc}{lambda
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