A ray of light strikes the surface of the photovoltaic metal as shown in the above figure. Identify which of the following statements is correct if a voltage is introduced into the metal by the light ray?
I. The light ray is a blue light.
II. The wavelength of beam is below the threshold.
III. The beam does not contain any photons

I only

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II only

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I and III only

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II and III only

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I, II, and III

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Solution

The correct option is B I only
We are told in the statement of the situation that a voltage is produced by photons striking the metal. This means the minimum threshold to meet the work function must have been met. This tells us the light is blue light, because the other two statements imply no voltage is produced in the metal.
Therefore, the correct answer is option A.

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