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

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sure brought to you by aliens As far as we

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

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

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well they were already here Alien ships crash landed on

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earth with the extraterrestrials are in desperate need of you

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to thirty three to return to their home planet Having

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

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the substance required to make you two thirty three However

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they do have following equation this one right there and

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

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a type of electron emitting radioactive decay Determining the mass

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number of j will tell us what element to search

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for So what is the mass number of jay And

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

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they never seem to be prepared There must not be

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

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freaks out notation might make this a little unclear So

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clean it up a bit by taking out those betas

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and subbing in the notations for electron we see that

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

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

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the equation will no take that too Now we can

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

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thing called conservation of mass that we have to deal

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with mass number or a on the right side has

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evil the mass number on the left side So the

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sum of the mass of the starting point here and

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less j test equal the sum of the mass of

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the ending point You plus e plus gama if the

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

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

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number So just looking at the masked number we now

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have this equation we saw for a yeah we find

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it has a mass Number of two Thirty two Which

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means correct answers to see With this solve the aliens

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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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