plz give me detail explanation Q : In a calibration experiment light of waveleng

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plz give me detail explanation

Q: In a calibration experiment light of wavelength less than 241 nm and intensity I is established to be able to produce a photocurrent at a detector plate when illuminating a metal surface in a vacuum. The detector plate is held at a voltage of +10 Volts with respect to the metal surface.  

A series of 3 new lamps are then used in the apparatus. Lamp A has a wavelength of 243 nm and intensity 36 I. Lamp B has a wavelength of 103 nm and an intensity of 0.01 I. Lamp C has a wavelength of 203 nm and an intensity of 4 I. The lamps which will generate a photocurrent in the experiment, for a detector plate voltage of +1.8Volts, are:

[A]          A

[B]          A, B and C

[C]          A and B

[D]          B and C

[E]           none of the above

Select one:

Explanation / Answer

[C] A and B

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