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AP Physics 2 Videos 59 videos

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AP Physics 2: 2.2 Changes and Conservation Laws 4 Views


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AP Physics 2: 2.2 Changes and Conservation Laws. Which of the following is not one of the possible energy levels for double-ionized lithium?

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Transcript

00:04

And here's your shmoop du jour brought to you by repetition [Man with a paddle hitting a ball]

00:06

repetition repetition...All right some of the info in this drill was part of the

00:11

last drill but don't worry we're not going to repeat ourselves yeah we just [People watching a screen]

00:14

need to be aware that some of the info in this drill was part of the last drill

00:17

but we're not going to repeat ourself... we did deja vu there all

00:21

right moving on okay, the ionization energy for double ionized lithium which

00:26

has the equal three protons is negative 13.6 electron volts which of the

00:32

following is not one of the possible energy levels for double ionized lithium

00:36

and here are the potential answers.... okay if you watch the last video the info on the [A couple watching protons spinning]

00:43

number of protons and ionization energy will sound familiar if you didn't watch

00:46

it well go check it out it's fantastic you'll laugh you'll cry and you'll just [People laughing]

00:50

learn a thing or two maybe and more importantly you'll have the math to

00:54

solve this question well in that last question we use Bohr's formula to find

00:58

the energy level of this atom the formula is e sub N equals Z squared over

01:02

N squared times the ground state energy level looks like that with Z at three [Bohr's equations on a board]

01:08

and a ground state energy level equaling the ionization energy negative thirteen

01:12

point six we know that the energy levels equal 9 over N squared times negative 13

01:17

point 6 well now we can just plug in numbers for n to see what works and what

01:21

doesn't if n equals 1 we find that the energy level equals negative 122.4

01:26

electron volts answer B) is a possible energy level so it's not the right

01:30

answer as we plug in more numbers will find that A) and C) are the n values of 2 [Answers A and C flashing]

01:35

and 5 respectively so those answers are out too but there's no whole number n

01:40

value that'd make D) a possible answer so that's the correct answer for this

01:44

question - N will always be a whole number after all there's no such thing

01:48

as energy level one and a half so it's not too hard to figure out the energy [Girl reading energy level book]

01:53

level as long as we know the atomic number and the ground state energy it

01:57

might take a little trial and error but we'll be able to do the math and get it [Boy stood by a slot machine]

02:00

right.. Sure, it might feel a little repetitive changing out the value for n

02:03

a few times but let's face it repetition is a fact of life in science and math so

02:08

as we were saying and here's your shmoop du jour brought to you by...[Man hitting ball with a paddle]

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