A) takes place
B) doesnt take place
C) may or may not take place
D) depends on frequency
Correct Answer: A
Solution :
If kinetic energy of photoelectrons emitted from metal surface is \[{{E}_{k}}\] and \[W\] is the energy required to eject photoelectrons from the metal, then from Einsteins photoelectric equation \[{{E}_{k}}=hv-W\] Also, \[E=\frac{hc}{\lambda }\] where \[h\] is Plancks constant and \[c\] is speed of light and \[\lambda \] is wavelength. Since wavelength is reduced from \[2300\overset{\text{o}}{\mathop{\text{A}}}\,\] to\[1800\overset{\text{o}}{\mathop{\text{A}}}\,\], energy increases hence emission takes place.
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