Photovoltaic voltage decreases with reduced light intensity Steps:

• Identify the setup as a solar cell circuit, where light generates a positive voltage reading on the voltmeter.
• Recall that solar cell voltage output increases with light intensity due to more photoexcited charge carriers.
• Determine that decreasing light intensity reduces charge carrier generation, lowering voltage.
• Note that keeping temperature unchanged isolates the light effect without temperature's opposing influence.

Why A is correct:

• Per the photovoltaic effect, lower light intensity means fewer photons excite electrons, reducing the built-in potential and voltage output.

Why the others are wrong:

• B: Combines light decrease (lowers voltage) with temperature increase (also lowers voltage), confounding the isolated cause.
• C: Temperature decrease raises solar cell voltage by widening the bandgap, increasing the reading.
• D: Temperature decrease raises voltage, offsetting the light-induced drop for an uncertain net effect.

Final answer: A