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AP Physics 2 Videos 59 videos

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AP Physics 2: 2.2 Probability and Systems 175 Views


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AP Physics 2: 2.2 Probability and Systems. What is the mass number of J?


Transcript

00:00

Thank you We sneak and here's your chum up to

00:05

sure brought to you by aliens As far as we

00:07

know aliens have never landed on earth again We've had

00:10

enough seriously weird science teachers that wouldn't surprise us if

00:13

well they were already here Alien ships crash landed on

00:17

earth with the extraterrestrials are in desperate need of you

00:20

to thirty three to return to their home planet Having

00:24

limited english speaking abilities they don't know the name of

00:26

the substance required to make you two thirty three However

00:29

they do have following equation this one right there and

00:34

mark's neutrons and beta is beta minus decay which is

00:39

a type of electron emitting radioactive decay Determining the mass

00:42

number of j will tell us what element to search

00:44

for So what is the mass number of jay And

00:47

here are potential answers Well see that's thing about aliens

00:54

they never seem to be prepared There must not be

00:56

a space boy scout model but we'll help these little

00:59

freaks out notation might make this a little unclear So

01:02

clean it up a bit by taking out those betas

01:04

and subbing in the notations for electron we see that

01:07

electrons don't add anything to the masked number And since

01:10

we're dealing with a neutron on the left side of

01:12

the equation will no take that too Now we can

01:15

write the equation like this mary because there's a little

01:20

thing called conservation of mass that we have to deal

01:23

with mass number or a on the right side has

01:26

evil the mass number on the left side So the

01:29

sum of the mass of the starting point here and

01:31

less j test equal the sum of the mass of

01:34

the ending point You plus e plus gama if the

01:38

mass number of the iranians it's two thirty three the

01:41

electron and the anti neutrino don't contribute to the mass

01:45

number So just looking at the masked number we now

01:47

have this equation we saw for a yeah we find

01:52

it has a mass Number of two Thirty two Which

01:55

means correct answers to see With this solve the aliens

01:58

can be on their way Maybe this means mrs frederiksen 00:02:01.112 --> [endTime] can return to her home planet

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