## Post Module Assessment Number 20

H-Atom ($E_{n}=-\frac{hR}{n^{2}}$)

ayushibanerjee06
Posts: 177
Joined: Thu Jul 11, 2019 12:16 am
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### Post Module Assessment Number 20

Can someone explain what the answer is for #20?
If 1 million photons in the UV region are absorbed by a hydrogen gas sample how many electrons are excited to a higher energy level?
A. zero
B. 500,000
C. 1
D. 1 million

Is it D?

ishaa Diwakar 4E
Posts: 56
Joined: Wed Sep 11, 2019 12:17 am

### Re: Post Module Assessment Number 20

Yes, it is D, because there is one electron that will be excited by every one photon (1:1 ratio).

ayushibanerjee06
Posts: 177
Joined: Thu Jul 11, 2019 12:16 am
Been upvoted: 1 time

### Re: Post Module Assessment Number 20

Thanks (:

Dakota Walker 1L
Posts: 58
Joined: Wed Sep 18, 2019 12:17 am

### Re: Post Module Assessment Number 20

Because hydrogen has one electron for every H atom, the number of excited electrons will be equal to the number of excited hydrogen particles, which in this case is 1 million.

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