Question

Which energy-level change shown in the diagram below emits electromagnetic radiation with the longest wavelength?

a) an electron moving from 4 to 5
b) an electron moving from 5 to 2
c) an electron moving from 6 to 1
d) an electron moving from 2 to 1

Answer 1

@aaronq Would you please help me again? Thanks! Hehe

Answer 2

"emitting" means that it's going from a higher level to a lower level. eg. 6 to 5

wavelength is tricky because you'd imagine that longer wavelengths mean more energetic, right? but it's actually the opposite.

longer wavelengths = less energy
shorter wavelengths = more energy

so i'll rephrase the question: Which energy-level change shown in the diagram below emits electromagnetic radiation with the least energy photon?

Answer 3

least energy = least distance transited

Answer 4

Would it then be 5 to 2? It is quite clear according to this chart. the one I received as a handout has the distance between 2 to 1 and 5 to 2 to be equal...

Answer 5

yeah, thats the right answer, the only two possibilities would be

b) an electron moving from 5 to 2
c) an electron moving from 6 to 1

since the others are absorbing, not emitting photons.

Answer 6

Oh I see. Thanks. Could I ask you one more question? (without having to make another separate question)

Answer 7

sure, what is it?

Answer 8

Which molecule is not pyramidal? a) PH3 b) CO3 2- c) AsH3 d) ClO3 -

Answer 9

sorry i was re-reading the first question and i noticed that option d) 2 to 1, was also a viable option. But the diagram shows that it's a longer distance. (the answer is still 5 to 2).

Now addressing the other question..

you have to draw them according to VSPER theory

Answer 10

Otherwise, there is no easy way to see, unless by memory

Answer 11

have you heard of VSPER?

Answer 12

Yes I have.

Answer 13

okay, awesome. Just do that

Answer 14

It is CO3 2-? I just want to make sure because I'm not very good at drawing them...

Answer 15

yes, indeed it is.

Answer 16

Thanks so much!!!! :D

Answer 17

no problem dude !