Light of frequency strikes a metal with a work function of . What is the maximum kinetic energy of ejected photoelectrons? ()
Answer and explanation
Correct answer: B.
- Step 1: Calculate incoming photon energy: .
- Step 2: Apply Einstein's photoelectric equation: , where .
- Step 3: Subtract work function: .
Answer
1.97 eV.
Why not the others: '' is total photon energy without subtracting work function; '' subtracts ; '' is work function.
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