21 This energy diagram shows the allowed energy levels of an electron in a certa

Question

21 This energy diagram shows the allowed energy levels of an electron in a certain atom. (Note: the SI prefix 'zepto' means 10 .You can find the meaning of any SI prefix in the ALEKS Data tab.) 1400 energy (2)) Use this diagram to complete the table below. What is the energy of the electron in the ground state? zJ 10 What is the energy of the electron in the first excited state? If the electron makes the transition shown by the red arrow, from A to B, will a photon be absorbed or absorbed O emitted mitted? Calculate the wavelength of the photon that would be

Explanation / Answer

1)

energy in ground state is 350 zJ (It is shown by A)

2)

energy in 1st excited state is 600 zJ (It is shown by B)

3)

When going from A to B, energy is absorbed

4)

Energy absorbed = EB - EA

=600 - 350

= 250 zJ

= 250*10^-21 J

= 2.50*10^-19 J

use:

E = h*c/lambda

2.50*10^-19 J =(6.626*10^-34 J.s)*(3.0*10^8 m/s)/lambda

lambda = 7.95*10^-7 m

lambda = 795 nm

Answer: 795 nm

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