Physics 10 - Lecture 05: Radioactivity

[sangfroidjen]

For those of you out there who haven't read his book, I highly recommend it.

[lovelplants]

hmm.. i better buy that radioactive detector.. ganda ng lecture daming examples..

[terahba]

every high school physics class should spend a semester on these videos. my teachers dont know jack, reading out of a book because they barely know the syllabus themselves. thankyou UC Berkeley (from Australia)

[SuperXero96]

we all r exposed to some radiation each day due to the toxic sun rays

[AKKAfer]

@SuperXero96 toxic? since when sun rays are toxic

[NANOFORGE]

@AKKAfer The Suns rays have allways been toxic. The rays from any star is toxic. You see stars gain all of their incacuable energy by converting billions of tons of Hydrogen into Helium in a process called nuclear fusion. This process releases vast amount of heat and free electrons in the form of Gamma radiation. Stars release many types of radiation into space, Infared, ultra violet, gamma, visible and x-rays are just some. Earth is natrually protected from this radiation by it's magnetosphere.

[SuperXero96]

im only 14 and i know half of the stuff alot of 50 year teachers of nuckleaur atons sadly i am half asleep atm

[abok7lan]

u have an amazing instractor there

[pucksterz12]

How can there be such a large scale between the infinately small to the infinately large in our reality of this three dimensional universe we live in? Small being quantum mechanics and large being the unimaginable size, age, and number of stars and planets in this universe. But the two are completely tied together. Makes it hard to define our place as humans in all of this.

[mugwamp4]

@pucksterz12 well they are tied together but ,they dont reconcile with each other ..until the G.U.T is discovered we dont know why.

[motopilot322]

@pucksterz12

our place IS HUMAN... and we live in 11 dimensions... infinite is infinite...

[dwarfer777]

theres a 100% increase in views on this video since fukushima started blowing up

[classicaddict2010]

i want to take up BS Physics because of you sir!

:D

[BBoyEmanuel]

lmao we learned this stuff in 9th grade. fuck romania and it's education system, way to much information, way to early :s

[Nolexe]

I wish all teachers teaching physics were this good!

[hytlerson]

loved this

[tryceo]

I'm a sophmore in a school in ohio and I know about all of this... wtf?

[Krandolph17]

@tryceo This is mostly for non-science majors, people that may not ever be exposed to a lot of science to just get a basic understanding of some things. I too have known a lot of these things since I was 10 to 13 but I still found it fairly interesting, and I didn't know about sieverts and rems and the other things about cancer, which I really enjoyed learning.

[ItsNeuroscience]

...If I knew a quarter of what this man knows

[Hammerfly86]

@ItsNeuroscience Yeah and you can tell, by the way he speaks, that he didn't memorize these lectures. He actually knows all of this stuff. Seriously impressive.

[noxure]

This guy is an anecdote machine.

[charitycrafter]

@roflwaffle12321

This class is geared towards non-science people. Those who never take any science outside of the basic requirements.

[agent3999]

I love the way he teaches.....

great video

[00Avenger17]

Great video =) just discovered his vids - goldmine ^^ =P

[sparks444]

functional names are nice. glueons= easy to remember for an english speaker. Latin= not easy to remember.

[geganobo]

ive learned more on youtube in a month then ive learned after years of school

[roflwaffle12321]

im in highschool and i know this...

how did these people get into uc berkeley?

[stgeo838]

@roflwaffle12321

My guess based on the class size is its a Gen Physics course

[LedSkynHankDoors]

@roflwaffle12321 ...money

[minder42]

@roflwaffle12321 this class is called "physics for future presidents"

its a physics class with no math- taken by mostly liberal arts majors

[NickBlackDIN]

EletriZaty... lol, love the way he says it ^.^

[ZeppelinRochey]

Thank you so much you answered every question I could have thought of!

[Nodonnell11]

A cheesburger Rofl :P

[xos420]

when u where talking about atoms it reminded me of how electricity works. im an apprentice electrician, and in electricity you have a positive and negative charge, you also have a nuetral, or a return to home, for any non-used electricity. Does the nuetron of an atom act in a similar way?

[girocraz]

@xos420 I thought electricity was derived by electron. But anyway, yup. There's neutral part ( neutron ) , negative part ( electron? ) and positive ( Proton? ),

[jonathancoupal]

@xos420 I'm afraid not. Wiring for electricity is only about managing the flow (current) of electrons through a conductor. Elementary particles, such as electrons, protons, and neutrons have a charge (-1, +1, 0 respectively) which relates to how they interact with each other. Basically neutrons are electromagnetically "neutral" which indicates that they don't interact using the electromagnetic force with the other particles.

[rhelms73]

Here's one for you. Homeland Security is sewing RADIO ACTIVE ZIPPERS into american citizen's clothing who have been charged tryed and convicted in some kangaroo secret court without one word ever being spoken to them!!

[rhelms73]

Here's one for you. Homeland Security is sewing RADIO ACTIVE ZIPPERS into american citizen's clothing who have been charged tryed and convicted in some kangaroo secret court!!!!

[coolestdude80]

Professor Muller does such a good job explaining complex things in elementary terms.+++++

[MarcosKramser]

This is so cool

[scout6686]

morbid lecture interesting not packed enough with facts tho

[girocraz]

@scout6686 well, when youre in university its common that the lecture will not be packed with facts

[Paddler007able]

I saw his book in Costco last week

[MultiTheBest88]

WOAH ITS LONG

[mongoose100989]

if you didnt want me to remember the number then why did you write it motherfucker

[nbe05]

Ok I'm watch all of it since its always nice and interesting to recap physics, and i know its an introduction. BUT, i don't understand why its so basic? Its a university lecture!? Everything but the Sievert/rem part is rather common knowledge, or something you learn in 7th grade or so. - Guess i'll be watching the next ones too. Great initiative putting up these lectures here :]

[mike900999]

i a feel the same when i seen this it reminded me of my 9 th grade science teacher i no he is a very intelligent man iv read so of his papers thats how i found this video but i think he is jest making a easy course so that someone can say thay took a physics course it looks go on a resume lol

[ascheepe]

@44:44, for these stories see k19 widowmaker, that movie made me sick to my stomach. You all share great video's btw, keep it up.

[Acmak]

I do not understand one thing he says that the fission of a nuclei is followed by a huge release of energy I think that it is what happens in a nuclear reactor with uranium, but I do not understand why isn't there any releas of energy in the normal radioctive stuff like this watch he shows? (sorry for my english )

[SpeakerGendibal]

There is a large release of energy in normal radioactivity. When an atom decays, the energy of that decay is given to the kinetic energy of the two atom fragments. That is why beta and alpha particles fly away so fast and can cause damage to biological tissue.

[Iken69]

Because there is no chain reaction and the energy emitted is too "weak" to affect human tissue.

[1Airsprint1]

I don't completely understand your question but I will try to explain what I think you are asking. When a nuclear reaction happens its when a neutron is absorbed by an atoms nucleus and the nucleus of the Uranium or w/e mass they are using splits, setting of a chain reaction and throwing protons and electrons in every direction called Radioactive particles. So once the nuclear reaction happens there is no more release of energy it has already happend. Some radiation is not harmful also.

[esh1]

I love this lecture... My professor once made a joke about u92 while studying nuclear physics, "U is a unique matter and since Iraq and Afghanistan didnot start with U, so they cannot have uranium...."

[hellomycognomen]

Outstanding lecture, very informative and interesting

[ramsey1948]

i like the way mr muler presents his material

[Nes232]

Now I understand why the US wants to stop Iran from developing nuclear power plant, is not because of nuclear missiles. Is because of potential terrorist getting hold of uranium.

[Nes232]

the quark reference made me LOL

[SupremeChickenx]

i just love humourous professors

[Masterfrigger]

its not radioactive enough to do harm

[brinebot]

It's great how he holds that radioactive stuff next to his face

[vsadlarry]

yup lol

[SpeakerGendibal]

they are alpha and beta emitters. Alpha and beta particles dont penetrate human skin. They only do damage if they are inhaled or ingested.

[supercalefredjalist]

'So if you have 6 times 10 to the 23rd atoms you get...you know...you get a cheeseburger.'

Brilliant

[MapleCap]

This is a first year physics course. Generally, we have up to 4'th level courses, then masters could be attained after that.

[stelivo1]

i'd like to know (if any of you know) what equilevent course is this to a uk course? for instance A level? or degree? because i am from england and im hopefully going to be taking an A level next year in physics , then hopefully a degree in the same field ( an a level by the way is the first course in further education to take in the uk then its a degree then masters ect)

[underweightHater]

i dont think there is any equivelant to this course. it was designed for college students who are NOT going to major in physics but would like an overview, so it isnt part of the physics curriculum.

i think if you plan to major in physics you get thrown into the dungeon to do calculations. no fun courses for you!

[stelivo1]

lol, thanks for the info. I just find physics fascinating . and using these video's for information aswell as over sources. because in school the science we are taught is very basic ,most of the stuff covered here is also basic but obviously as you say its not for students who hope to major in physics.Intresting non the less. and thanks

[divy34fasho]

Underweight is right. The class is designed for law majors.

[stelivo1]

This guy is absolutly amazing

[quarkphotonect]

A wee bit simple I could have taught that + the statement he said about 1eV = moving 1 electron in a chemical recation it is actually about 16eV

But is very Good I have watched it all and will watch all the leactures, they cant hurt!

[quarkphotonect]

Great!

[purplemonkeyelephant]

Ahhh just got interesting before it cut out. I guess you have to go to Berkely to get educated not YouTube :p

[uuserneim]

The entire course is available on Youtube, check the right tab, next lecture is number 5: Radioactivity II

[psycherevolt]

Nice cloud chamber!

[cpricejones]

definitely the coolest thing i've seen today!

[hagenisse]

Thank you for this video, ucberkeley.

5 of 5.

[chinaxinzh]

nice

[rajatsuvra]

nice clear lecture.

[supercourse2]

i cut a glow stick in half it smell like plastic

[MajorUtah]

Good to see ya here.. ^XD

[ravenwendigo]

Safety? naaah...

[therubixcomplex]

beta radiation is not stopped by skin, and its by far the most dangerous form of radiation as it can both pass through skin and is highly ionizing. it takes a sheet of aluminium thats a few millimetres thick to stop beta radiation. Alpha radiation, in contrast, can be stopped with a sheet of paper.

[chickenbot1]

Joshua! Is that a nuclear bomb? Where did you learn how to make this?

I found out how on the internet... i'm finally gonna show that bitch teacher, Mrs henderson a thing or two about physics....

[MajorUtah]

WTF??

[lunaticaution]

I <3 This guy's lectures

[proudjester]

Zee goggles! Zey do nothing!

[jonaskates12ahh]

i am only 12 years old and im extremely interested in radioactivity and physics.its probably my favourite subject in school. well im actually canadian and not from california, actually im from nova scotia.

[Tyson200422]

Quick question about the H2O part. I know all you need is an oxodizer and a hydro carbin for combustion. So why is water non flamable and if it can be what process is needed to make it hapen.

[benberry515]

HE STOPPED SHORT

[Mechanisttm]

People he isnt saying it isnt dangerous he is saying like all things you have to be careful with it. How are you people not getting this. Also great lecture as always

[sn1pe352]

Great Lecture again , th ank you Berkeley and Muller

[KE5FX]

OK, so he's talking kilo(C)alories, and at least some of those lanterns actually can run on gasoline without nuking your tent. :-P I stand corrected.

[KE5FX]

And gasoline in a Coleman lantern?!

I don't know about future Presidents, but think I see where our *current* President took physics.

[KE5FX]

4000 joules in a calorie, huh. This strange new learning fascinates me!

[scrumptiousvittles]

I would imagine he is simply talking in terms of large calories, which are roughly 4000 joules.

[cobanc90]

hi out of interest, what physics qualification is this for? is it something like a ph.d? and how long does it last?

[FOREMANROCKYCOINS]

he is a great teacher

[delusionalethics]

Röntgen's name is said "wrenchen"?

[hedleypanama]

Did Bush took the course?

[GaSeRGuanoApes]

Heh he is like some our professors )

//Moscow Engineering-Physics Institute (Mephi)

[roblow12345]

If radiation isn't so dangerous like the man says, (see review session 8) then why are there still big parts of the Ukraine uninhabited?????????

[kristie567]

Simply because of the amount of radiation.

[musicalaviator]

To take his own metaphor. If fire isn't dangerous (we use it to cook, to light candles, etc) why do we fear forest fires (which can wipe out entire suburbs and cut swathes of destruction through thousands of miles sq of forest). From Australia, a number of years ago about 800 houses were destroyed by a bush fire in our Capital Canberra a few years ago. Compare this to cooking your saussage and steak on a woodfired barbeque.

[scrumptiousvittles]

The reason I fear but do not dread fire is that I have a well-evolved sense system that can warn me of its dangerous presence. I dread radioactivity, because I don't have a 6th Geiger counter sense. If the governments of the world collapse before we have interred our waste, geiger counters will be the hot ticket. Maybe highly radioactive sites will become religiously taboo, like Mount Olympus. Perhaps we will evolve to withstand the long-lived isotopes that may collect in the biosphere. Joyous!

[coolview0g]

Simply because there are not that many people in Ukraine, and most of them moved to the cities, because the life conditions are really bad in rural areas, not that much related to the amount of radiation... But I love my radioactive watch! this is a great lecture.

[tonyrueb]

it is very dangerous, it can kill you no doubt, so can fire, electricity, and water. we cook food because it is safer then eating raw meat, we use fire to do it too, you go to the dr and they take x-rays which is radiation and is bad for you, if you don't take precautions, that is what he says. it depends on the amount of exposure and kind of radiation.

[spcoulson19922]

with the radioactive watch is that still the same stuff they use today on them?? :$

[PotatoMasherJim]

ha ha, hope not and doubt it :P

Maybe if it was made in China :)

[stromwurm]

good teacher, fine busines!

[RedMistie]

A mosquito in a football stadium - amazing.