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The minimum energy that must be possessed by photons in order to produce the photoelectric effect with platinum metal is [Given The threshold frequency of platinum is 1.3 × 10 15 s -1 and h = 6.6 × 10 -34 Js.]

1. 3.21 × 10 -14 J
2. 6.24 × 10 -16 J
3. 8.58 × 10 -19 J
4. 9.76 × 10 -20 J

Correct answer: 8.58 × 10 -19 J

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