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Ionisation energy of potassium is $425 k J m o l^{- 1}$ . The minimum frequency of a photon that can effect the ionisation is

A. $96.5 \times 10^{15} s e c^{- 1}$

B. $1.065 \times 10^{14} s e c^{- 1}$

C. $1.065 \times 10^{12} s e c^{- 1}$

D. $1.065 \times 10^{15} s e c^{- 1}$

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Correct Answer : D.

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