The value of threshold wavelength for photoelectric effect is $7000 A^{o}$ . Which of the following radiations will not produce photoelectric effect?

Violet

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Ultraviolet

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Infrared

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Yellow

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Solution

The correct option is C Infrared
Light with wavelengths below a certain cutoff value, called the threshold wavelength, would not eject photoelectrons from the metal surface no matter how bright the source.
Since the given threshold wavelength is $7000 A^{o}$ , the radiation producing photoelectric effect has to be infrared.
So, the answer is option (C).

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The value of threshold wavelength for photoelectric effect is 7000Ao. Which of the following radiations will not produce photoelectric effect?

The value of threshold wavelength for photoelectric effect is $7000 A^{o}$ . Which of the following radiations will not produce photoelectric effect?