The threshold frequency for a metal is 7.0 × 1014 s-1. Calculate the kinetic energy of an electron emitted when radiation of frequency 1.0 × 1015 s-1 hits the metal.
1.98 × 10-18 J
1.98 × 10-19 J
2 × 10-16 J
2 × 10-19 J
K.E = h(ν – ν₀) = 1.98 × 10-19 J
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