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AP Physics 2: 1.5 Properties of Objects and Systems 170 Views


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AP Physics 2: 1.5 Properties of Objects and Systems. According to the Bohr's model of the atom, which of the following are true?

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Transcript

00:00

Look And here's your shmoop du jour brought to you

00:04

by electron liberation which sounds like the tiniest political movement

00:09

in the universe according to bores Model of the atom

00:14

Which of the following is true Select two answers And

00:18

here the potential answers All right four meals Simon energy

00:26

All right well niels bohr was a huge contributor to

00:28

our understanding of the physical world he also founded What's

00:31

now known as neil's bohr institute could be a little

00:35

weird taking a class from someone called professor board Though

00:39

boris model of the atom is still one of the

00:41

best ways to think about and visualize these sub sub

00:45

sub microscopic particles The bohr model describes how electrons orbit

00:50

the nucleus of an atom Electrons orbited different levels We

00:54

didn't think of it like our solar system where the

00:56

planet's orbit at different distances from the sun The different

00:59

orbital distances in adam are set based on the energy

01:02

level of the electrons that well closer to the nucleus

01:06

Electrons are in lower energy orbits so it takes more

01:10

energy to move them away from the nucleus I didn't

01:13

get sucked in let's Look at this diagram of hypothetical

01:16

energy levels in an adam we can see that it

01:19

takes more energy to move an electron from the lowest

01:22

orbit to the point where it's completely liberated from the

01:25

atom than it does to move an electron from a

01:27

higher orbit So this means aids incorrect now One electron

01:32

is in a higher energy state and then loses energy

01:36

It moves back down bolstered of the nucleus like that

01:40

And when this happens the electron beam it's a faux

01:42

thanh like shooting off a flare gun as it's running

01:45

out of gas The wavelength of that proton is related

01:52

to the change in energy of the electron The smaller

01:55

the change in energy the longer the wavelength Well the

01:58

wavelength of the admitted photons equals planks Constant times The

02:02

speed of light divided by the change in energy equation

02:06

looks like that the equation here place constant is represented

02:09

by age Now remember that diagram we saw earlier with

02:13

the energy level thing Yeah let's Look at it again

02:15

We can see that the biggest difference in energy is

02:18

between the first and second level's Answer b says that

02:22

the longest wavelength of photons can have is between any

02:25

calls to an n equals one levels They're looking at

02:28

the diagram We can see there's no way that's true

02:30

largest difference in energy is between the n equals one

02:33

and n equals two levels so that it mean the

02:35

resulting photons would have the shortest wavelength The answer is

02:40

incorrect also Okay we're making progress We know what the

02:44

wrong answers are And being smarties were able to deduce

02:47

that the right answer here is see andy but just

02:50

for fun Let's figure out why they're right And yet

02:52

we know our idea of funds Little weird All right

02:56

Answer c says that the energy required to liberate an

02:58

electron from the end energy level is different for all

03:01

atoms of different elements With only one electron Well the

03:04

formula to calculate the amount of energy needed A liberating

03:07

electron is the atomic number over the energy level times

03:10

negative thirteen point six electron volts that's the equation right

03:13

there Because adam's all have a different atomic number based

03:17

on the number of protons in their nuclei the energy

03:20

level will always be different And answer D states the

03:23

energy required to liberate an electron from a smaller radius

03:26

Orbit is larger than for a large radius orbit Right

03:31

Well this matches what we've already seen in our electron

03:33

level diagram this thing after all an electron closer to

03:37

the nucleus will have a smaller orbital radius Like how

03:40

mercury has a smaller orbital radius around the sun And

03:44

we do on earth Well these atomic structures look simple

03:47

but as physicists we know that nothing is as simple

03:50

as it looks A lot going on even the tiniest

03:52

of systems But there aren't subatomic politics That would just

03:56

be silly Which is a good thing because in a 00:03:58.17 --> [endTime] particle campaign election electrons would always go negative

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