# A metal has work function 4 ev what is the kinetic

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A metal has work function 4 eV. What is the kinetic energy of a photoelec- tron if radiation of wavelength 200 nm falls on the surface of the metal? The value of h c is 1240 eV · nm . What wavelength is emitted when the pho- ton jumps from B to A ? Explanation: In the Compton e ff ect, the photon loses energy, so its frequency decreases. 012 (part 1 of 2) 10.0 points In the diagram the energy di ff erence between states B and C is twice the energy di ff erence between states A and B . In a transition from C to B , an electron emits a photon of wavelength 450 nm. A B C
011 10.0 points When a photon hits an electron and gives it energy, what happens to the frequency of the photon after bouncing from the electron? 013 (part 2 of 2) 10.0 points What is the emitted wavelength when it jumps from C to A ?
1. The frequency remains the same. 2. It requires a case-by-case analysis. 3. The frequency increases. 4. The frequency decreases. correct Explanation: Let : E CA = 3 2 E CB . λ CA λ CB = E CB E CA = 2 3 λ CA = 2 3 λ CB = 2 3 (450 nm) = 300 nm .
gilbert (amg3448) – HW13 – tsoi – (57210) 5 014 (part 1 of 2) 10.0 points If, in 1 λ = R y 1 1 n 2 2 , you set n 1 = 1 and take n 2 greater than 1 , you generate what is known as the Lyman series . Consider the next three members of this se- ries. The wavelengths of successive members of the Lyman series approach a common limit as n 2 → ∞ . What is this limit?
= 121 . 505 nm . 015 (part 2 of 2) 10.0 points
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