Ultraviolet radiation of wavelength 121 nm is used to irradiate a sample of potassium metal. The work function of potassium is 2.25 eV. Calculate the speed of the electrons emitted through the photoelectric effect.
A) 1.89*106 m s-1
B) 1.18*106 m s-1
C) 0.890 * 106 m s-1
D) 1.68 * 106 m s-1
Correct Answer:
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