Dual Nature of Radiation and Matter

Question: Work function of a metal is 2.51 eV. Its threshold frequency is



1) $5.9 \times {10^{14}}$cycle/sec
2) $6.5 \times {10^{14}}cycle/\sec $cycle/sec
3) $9.4 \times {10^{14}}cycle/\sec $cycle/sec
4) $6.08 \times {10^{14}}$ cycle/sec
Solution: Explanation: No Explanation
Photon and Photoelectric Effect

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