Platinum, which is widely used as a catalyst, has a work function O (the minimum energy needed to eject an electron from the metal surface) of 9.05 x 10^-19 J. What is the longest wavelength of light which will cause electrons to be emitted?

Platinum, which is widely used as a catalyst, has a work function O (the minimum energy needed to eject an electron from the metal surface) of 9.05 x 10^-19 J. What is the longest wavelength of light which will cause electrons to be emitted?

Platinum, which is widely used as a catalyst, has a work function O (the minimum energy needed to eject an electron from the metal surface) of 9.05 x 10^-19 J. What is the longest wavelength of light which will cause electrons to be emitted?




A) 2.196 x 10^-7 m
B) 4.553 x 10^-6 m
C) 5.654 x 10^2 m
D) 1.370 x 10^15 m
E) >10^6 m






Answer: A


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