The figure shows the energy level diagram of Element X. ( Figure 1 ) http://sess

Question

The figure shows the energy level diagram of Element X.(Figure 1)

http://session.masteringphysics.com/problemAsset/1169865/2/jfk.Figure.29.Q16.jpg

Please just answer the questions clearly in sentances

B) An atom in the ground state absorbs a photon, then emits a photon with a wavelength of 1240 nm. What conclusion can you draw about the energy of the photon that was absorbed?

C) An atom in the ground state has a collision with an electron, then emits a photon with a wavelength of 1240 nm. What conclusion can you draw about the initial kinetic energy of the electron?

Explanation / Answer

B) energy = hc/ lamda = 6.627 * 10^-34 * 3 *10^8 / ( 1240 * 10^-9 * 1.6 *10^-19 ) = 0.01 * 10^2 = 1 ev

factor of 1.6*10^-19 is divided to obtain energy in electron volt

energy corresponding to 1240 nm is 1 ev

so, incident energy should be more than 1 ev

clearly you can see that.

energy of photon should be E3 -E1 = -1-(-4) = 3 ev

C) inital kinetic energy will be difference of E3-E1 = 3ev

so electron K.E is 3 ev.

first electron is in ground state, then it jumps to n=3, from where it jumps to n=2 by emitting a photon of 1240 nm

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