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Light of wavelength 2,000 overset @A fal...

Light of wavelength `2,000 overset @A` falls on an aluminium surface.In aluminium 4.2 eV are required to remove an electron.
find cut off waveelrnght for aluinium?Given,Planck's constant , `h=6.6 xx 10^(-34) J s,c= 3 xx 10^8 m s^(-1)`.

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MODERN PUBLICATION-Particle Nature of Radiation-EXERCISE
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