18. The minimum energy required to cause the photo- electric effect in potassium metal is 3.69 × 10-19 J. Will photoelectrons be produced when visible light shines on the surface of potassium? If 520 nm radia- tion is shone on potassium, what is the velocity of the ejected electrons?

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18. The minimum energy required to cause the photo-
electric effect in potassium metal is 3.69 × 10-19 J.
Will photoelectrons be produced when visible light
shines on the surface of potassium? If 520 nm radia-
tion is shone on potassium, what is the velocity of the
ejected electrons?
Transcribed Image Text:18. The minimum energy required to cause the photo- electric effect in potassium metal is 3.69 × 10-19 J. Will photoelectrons be produced when visible light shines on the surface of potassium? If 520 nm radia- tion is shone on potassium, what is the velocity of the ejected electrons?
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