ultraviolet radiation off AAMC 9

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bonloblaw

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Hey y'all,

question from AAMC 9 #32.

Which of the following statements could explain the frequently bluish color of EQLs?
A) Sodium salts are common in earth's crust, and sodium emissions can be quite bright.
B) In transparent substances, dispersion effects are in general greater for longer wavelengths.
C) The ultraviolet radiation is absorbed by molecules that then fluoresce at yet shorter wavelengths.
D) The ultraviolet radiation is absorbed by molecules that then fluoresce at yet longer wavelengths.

The correct answer is D and I don't quite understand AAMCs explanation. Can anybody help out?

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Hey y'all,

question from AAMC 9 #32.

Which of the following statements could explain the frequently bluish color of EQLs?
A) Sodium salts are common in earth's crust, and sodium emissions can be quite bright.
B) In transparent substances, dispersion effects are in general greater for longer wavelengths.
C) The ultraviolet radiation is absorbed by molecules that then fluoresce at yet shorter wavelengths.
D) The ultraviolet radiation is absorbed by molecules that then fluoresce at yet longer wavelengths.

The correct answer is D and I don't quite understand AAMCs explanation. Can anybody help out?

It would help to know which part you don't understand.

When UV radiation excites electrons to a higher energy state, the jump back down can take place in more than one step, with each step emitting less energy than the original jump up. Less energy = lower frequency (E=hf) = longer wavelength.

Not sure if that made it more clear.
 
It would help to know which part you don't understand.

When UV radiation excites electrons to a higher energy state, the jump back down can take place in more than one step, with each step emitting less energy than the original jump up. Less energy = lower frequency (E=hf) = longer wavelength.

Not sure if that made it more clear.

Does the bold part not clarify it?

Electron Low Energy --> absorb UV --> Electron High Energy

Electron High Energy --> releases blue visible light --> Electron Medium Energy --> releases more blue visible light --> Electron Low Energy
 
Does the bold part not clarify it?

Electron Low Energy --> absorb UV --> Electron High Energy

Electron High Energy --> releases blue visible light --> Electron Medium Energy --> releases more blue visible light --> Electron Low Energy

Right. Got it. Thanks!
 
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