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Relating knowledge across scales, concepts, and representations Videos 7 videos

AP Physics 2: 1.1 Changes and Conservation Laws
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AP Physics 2: 1.1 Changes and Conservation Laws. Which of the following statements are true?

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AP Physics 2: 1.5 Changes and Conservation Laws. Which of the following statements is correct?

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AP Physics 2: 2.5 Fields in Space. Which of the following statements is true?

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AP Physics 2: 1.5 Waves 2 Views


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AP Physics 2: 1.5 Waves. Which of the following explains why quantum mechanics is only applicable at the particle level?

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Transcript

00:00

Thank you We sneak and here's your shmoop toos your

00:05

brought to you by quantum mechanics And we're not talking

00:08

about the tiny guys who can fix a car different

00:12

kind of a camp All right which of the following

00:14

explains why quantum mechanics is applicability only at the particle

00:18

level Select two answers and here's some choices And we're

00:24

done reading Yeah all right Quantum physics is well weird

00:29

like really weird Like what the heck is going on

00:31

in the universe Weird ever hear someone say you can't

00:35

be two places at once Well quantum physics has shown

00:39

that some particles can in fact be in two places

00:42

at one time and the act of observing a particle

00:45

affect how it moves That's right Just looking at something

00:48

can determine how that's something acts A lot of these

00:51

ideas came from the work of louis debra a french

00:54

brainiac who did a lot of work on this stuff

00:56

In the nineteen twenties He had a theory that everything

00:59

could be looked at as own wave No he wasn't

01:02

a surfer at least not that we know of He

01:05

was just trying to make sense of the weirdness of

01:07

quantum mechanics One thing that's not weird about quantum mechanics

01:10

though is the fact that they still inhabit the same

01:13

universe as the rest of us way all live in

01:16

yellowstone so they have to deal with the same constance

01:20

is we do Constance don't change on a subatomic level

01:24

because they're a constant so is not one Of the

01:27

right answers they're crossing dubray theorized that any moving object

01:32

could be observed as a wave Well if you run

01:36

around the block you too can be a wave We'll

01:39

stay here on the couch though sounds like a lot

01:40

of work to be a wave Objects that are human

01:43

size have a very tiny wavelength so tiny that it

01:47

really doesn't mean anything smaller the object however the larger

01:51

the wavelength and you have to get down pretty small

01:53

for the observed wave to make a real difference in

01:56

how an object interacts with other fields and particles So

01:59

answer b is one of the correct choice right there

02:02

that's correct and this whole wave particle duality where a

02:05

seemingly solid particle can behave like a wave is only

02:09

observable at the scale of adam's or even smaller subatomic

02:13

particles After all if we run around the block no

02:15

one will say look at that wave go They'll say

02:19

are you dying Should we call an ambulance And we're

02:22

also saying that sea is the other correct answer but

02:25

just because it can only be observed on a very

02:27

small scale doesn't mean we couldn't calculate the wavelength of

02:30

a larger object Wait maybe some crazy number like two

02:35

to the negative one thousand but it can definitely be

02:38

calculated So d is incorrect Also yeah quantum mechanics air

02:43

counterintuitive in a lot of ways so they can be

02:44

pretty confusing It's hard to think of A building is

02:47

acting like a wave and it's hard to envision something

02:50

as tiny as an electron period But it's pretty cool

02:53

stuff plus of anyone ever is annoying us While we

02:56

could just start explaining quantum physics to him usually they'll

02:59

get so confused They'll just act like a wave on 00:03:02.223 --> [endTime] flow away from us

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