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Sodium atoms can be ionised by supplying an energy of 118 kcal mol-1. Using this data, calculate the lowest possible frequency of light that can ionise a sodium atom.

(h = 6.624 x 10-27 erg.sec, c= 3 x 1010 cm sec-1).

(A) 1.24 x 1015 sec-1

(B) 0.24 x 1015 sec-1 

(C) 12.4 x 1012 sec-1

(D) 2.31 x 1018 sec-1