Dual Nature of Radiation and Matter

Question: Energy required to remove an electron from aluminium surface is 4.2 eV. If light of wavelength 2000 Å falls on the surface, the velocity of the fastest electron ejected from the surface will be



1) $8.4 \times {10^5}m/sec$
2) $7.4 \times {10^5}m/sec$
3) $6.4 \times {10^5}m/sec$
4) $8.4 \times {10^6}m/sec$
Solution: Explanation: No Explanation
Photon and Photoelectric Effect

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