In an experiment, shinning which type of light on a strip of metal would be least likely to produce the photoelectric effect?

a. ultraviolet light
b. dim blue light
c. bright red light
d. bright yellow light

C red light isn't an efficient source of light

Bright red light.

Explanation:

The light when strikes on an object has the ability to show the photoelectric effect. Different light has different wavelength that determines their photoelectric effects.

The ultraviolet light emit the large amount of energy whereas the redllight emits the least amount of energy. The bright red light is least likely to produce the photoelectric effect.

Thus, the correct answer is option (C).

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