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  4. Light of wavelength 5000 mathringA falls on a sensitive plate with photoelectric work function of 1.9 eV. The kinetic energy of the photoelectron emitted will be

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Q. Light of wavelength $5000\, \mathring{A}$ falls on a sensitive plate with photoelectric work function of $1.9\, eV$. The kinetic energy of the photoelectron emitted will be

Dual Nature of Radiation and Matter

Solution:

$E=W_{0}+K_{\max }$;
' $ E=\frac{12375}{5000}=2.475\, eV$
$\therefore K_{\max }=E-W_{0}$
$=2.475-1.9=0.57\, eV$