Why does light of a certain frequency need to be used to produce a current in the photoelectric effect?
A. The frequency of light must be the same as the frequency of vibration of the atoms in the substance to cause a current.
B. The atoms can only lose their electrons when they are provided with packages of energy of a certain discrete amount.
C. The atoms of the substance require specific frequencies of light to cause them to vibrate.
D. Only light of certain frequencies can penetrate the substance to a sufficient depth to cause the atoms to react.
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