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#### miss.strw

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##### Energy Level Question
« on: September 22, 2009, 10:08:01 PM »
I'm not sure but I think the answer is only (e) am I correct?

Considering only the energy levels

n = 1       n = 2       n = 3       n = 4

of the H atom, which of the following statements are true?

a)   Only three emission lines are possible

b)   Photons with the highest energy are emitted in a transition
from   level   n = 4 to level   n = 3

c)   Photons with the highest frequency are emitted in a transition
from   level   n = 4 to level   n = 3

d)   The emission line having the longest wavelength corresponds to a transition
from   level   n = 4 to level   n = 3

e)   The emission line having the shortest wavelength corresponds to a transition
from   level   n = 2 to level   n = 1

#### Schrödinger

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##### Re: Energy Level Question
« Reply #1 on: September 22, 2009, 10:23:33 PM »
No.

Think of the energy gap between successive energy levels.
"Destiny is not a matter of chance; but a matter of choice. It is not a thing to be waited for; it is a thing to be achieved."
- William Jennings Bryan

#### miss.strw

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##### Re: Energy Level Question
« Reply #2 on: September 22, 2009, 10:25:49 PM »
No.

Think of the energy gap between successive energy levels.

a)   Only three emission lines are possible

b)   Photons with the highest energy are emitted in a transition
from   level   n = 4 to level   n = 3

c)   Photons with the highest frequency are emitted in a transition
from   level   n = 4 to level   n = 3

d)   The emission line having the longest wavelength corresponds to a transition
from   level   n = 4 to level   n = 3

e)   The emission line having the shortest wavelength corresponds to a transition
from   level   n = 2 to level   n = 1

#### Schrödinger

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##### Re: Energy Level Question
« Reply #3 on: September 22, 2009, 10:31:55 PM »
you struck off the right answer.

clue1: energy gap between 2 consecutive levels decreases as we move away from the nucleus.

clue2:  $$E = \dfrac{hc}{\lambda}/$$
"Destiny is not a matter of chance; but a matter of choice. It is not a thing to be waited for; it is a thing to be achieved."
- William Jennings Bryan

#### miss.strw

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##### Re: Energy Level Question
« Reply #4 on: September 22, 2009, 10:36:18 PM »
you struck off the right answer.

clue1: energy gap between 2 consecutive levels decreases as we move away from the nucleus.

clue2:  $request=http://www.forkosh.dreamhost.com/mimetex.cgi?{+E+=+\dfrac{hc}{\lambda}}&hash=37ff09f02439e0355abc5f64e23e1c87$

a)   Only three emission lines are possible

b)   Photons with the highest energy are emitted in a transition
from   level   n = 4 to level   n = 3

c)   Photons with the highest frequency are emitted in a transition
from   level   n = 4 to level   n = 3

d)   The emission line having the longest wavelength corresponds to a transition
from   level   n = 4 to level   n = 3

e)   The emission line having the shortest wavelength corresponds to a transition
from   level   n = 2 to level   n = 1

I hope that I am correct this time. Thank you (snack) Please tell me if this is correct?

#### Schrödinger

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##### Re: Energy Level Question
« Reply #5 on: September 22, 2009, 10:39:30 PM »
You have certainly struck off the wrong answers.
But there is only one option that fits the bill.

Try using the clues.
"Destiny is not a matter of chance; but a matter of choice. It is not a thing to be waited for; it is a thing to be achieved."
- William Jennings Bryan

#### miss.strw

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##### Re: Energy Level Question
« Reply #6 on: September 22, 2009, 10:48:31 PM »
You have certainly struck off the wrong answers.
But there is only one option that fits the bill.

Try using the clues.

a)   Only three emission lines are possible

b)   Photons with the highest energy are emitted in a transition
from   level   n = 4 to level   n = 3

c)   Photons with the highest frequency are emitted in a transition
from   level   n = 4 to level   n = 3

d)   The emission line having the longest wavelength corresponds to a transition
from   level   n = 4 to level   n = 3

e)   The emission line having the shortest wavelength corresponds to a transition
from   level   n = 2 to level   n = 1

This is so hard. T__T

i know that a is out.
b is wrong since small gap = small energy
c b/c low enger = low fq

#### Schrödinger

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##### Re: Energy Level Question
« Reply #7 on: September 22, 2009, 10:53:10 PM »

Note clues 1 and 2.

They mean that the energy difference between n=4 and n=3 is the least among all the different possibilities among n=1,2,3,4.

So, 4 to 3 transition should correspond to the least energy.
Since energy and wavelength($request=http://www.forkosh.dreamhost.com/mimetex.cgi?{+\lambda+}&hash=41ad324ca8df5b0e45f60c120416dc0e$) are inversely related, lesser the energy, greater the $request=http://www.forkosh.dreamhost.com/mimetex.cgi?{+\lambda+}&hash=41ad324ca8df5b0e45f60c120416dc0e$.

So, option d) is correct.

hope this helps.
"Destiny is not a matter of chance; but a matter of choice. It is not a thing to be waited for; it is a thing to be achieved."
- William Jennings Bryan

#### miss.strw

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##### Re: Energy Level Question
« Reply #8 on: September 22, 2009, 10:59:00 PM »
God, I feel so dumb,
The blue one is that I am positive

a)   Only three emission lines are possible

b)   Photons with the highest energy are emitted in a transition
from   level   n = 4 to level   n = 3

c)   Photons with the highest frequency are emitted in a transition
from   level   n = 4 to level   n = 3

d)   The emission line having the longest wavelength corresponds to a transition
from   level   n = 4 to level   n = 3

e)   The emission line having the shortest wavelength corresponds to a transition
from   level   n = 2 to level   n = 1

i tot low engery = low freq T__T i dont understand what I am doing wrong?

while i'm doing this i was looking @ http://answers.yahoo.com/question/index?qid=20090922093943AAnVS6X

#### Schrödinger

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##### Re: Energy Level Question
« Reply #9 on: September 22, 2009, 11:03:42 PM »
isn't that question different from yours?
Don't get confused with it. Try starting afresh.

low energy does mean low freq
"Destiny is not a matter of chance; but a matter of choice. It is not a thing to be waited for; it is a thing to be achieved."
- William Jennings Bryan

#### miss.strw

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##### Re: Energy Level Question
« Reply #10 on: September 22, 2009, 11:12:54 PM »
isn't that question different from yours?
Don't get confused with it. Try starting afresh.

low energy does mean low freq

#### Schrödinger

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##### Re: Energy Level Question
« Reply #11 on: September 22, 2009, 11:30:20 PM »
no. the answer is just d.
"Destiny is not a matter of chance; but a matter of choice. It is not a thing to be waited for; it is a thing to be achieved."
- William Jennings Bryan

#### miss.strw

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##### Re: Energy Level Question
« Reply #12 on: September 22, 2009, 11:39:47 PM »
no. the answer is just d.

thank you so much T__T i hope i understand it .

#### Schrödinger

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##### Re: Energy Level Question
« Reply #13 on: September 23, 2009, 11:40:38 AM »
"Destiny is not a matter of chance; but a matter of choice. It is not a thing to be waited for; it is a thing to be achieved."
- William Jennings Bryan

#### LoveInQuanta

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##### Re: Energy Level Question
« Reply #14 on: September 23, 2009, 02:25:25 PM »
Hey hey, miss.strw!

I'm no expert by anyone's metric, but this is how I like to think of wavelengths/energy:

The shorter the wavelength, the more harmful the energy generated by that particle is. Think of the electromagnetic spectrum headed *right*, or shorter in wavelength, from the visible wavelengths. We're often told to stay out of the sun to avoid harmful UV rays, X-ray guns can in science fiction kill you (and in reality, you have to wear that protective lead vest when getting x-rays), and gamma rays, which have the shortest wavelength, are darn near uncontainable by anything, their energy is so high. Technology to harness gamma rays is relatively very, very new.

In short, the SHORTER it is, the more of a punch it packs - the higher its energy.

Hope this helps in the future.