Physics

Problem

Metals A and B have threshold wavelengths

620\,\text{nm}

and

450\,\text{nm}

respectively. Monochromatic light of wavelength

500\,\text{nm}

is incident on both. Which one of the following is correct? a) Only B emits photoelectrons b) Neither A nor B emits photoelectrons c) Only A emits photoelectrons d) Both A and B emit photoelectrons

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