Ultraviolet light with a wavelength of 280 nm is used in an experiment on the photoelectric effect with a lithium cathode (work function, W_o = 2.5…

Question

Ultraviolet light with a wavelength of 280 nm is used in an experiment on the photoelectric effect with a lithium cathode (work function, W_o = 2.5 eV). Find the stopping potential for the photoelectrons.

[h = 6.6 × 10⁻³⁴ Js, c = 3 × 10⁸ ms⁻¹, 1 eV = 1.6 × 10⁻¹⁹ J]

Answer 1

Ultraviolet light with a wavelength of 280 nm is used in an experiment on the photoelectric effect with a lithium cathode (work function, W_o = 2.5 eV). Find the stopping potential for the photoelectrons.

[h = 6.6 × 10⁻³⁴ Js, c = 3 × 10⁸ ms⁻¹, 1 eV = 1.6 × 10⁻¹⁹ J]

4.5 V
3.7 V
1.9 V ✓
2.8 V

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