Physics 10 - Lecture 06: Radioactivity II

[kanayumikumo]

he is saying pesticide is tested and found to be mild. i wonder what the bee's are saying about him.... btw, any radioactivity is hazards to our delicate health.

[786allahhuakbar]

@limegut ignore the physics of what he teaches, if u honestly cant see the propaganda and lies and bias in his lectures the hatred that he is spreading against certain types of people/countires etc u r obviously dumb and dont understand the way lecturers are chosen and kept in there positions the trends in uni research if u research on lecturers that have been sacked and y certain topics r taught. the way they r .4get it ur obv waste ov tym. dont mg me agen

[786allahhuakbar]

@limegut also i write the way i do to save space due to the restrictions on word count and its easier for me timewise, its not like a flippin english grammar essay. i suggest you get use to it, its the frickin norm online, in texts etc. why dont u watch his videos again and lisen to the non science comments muller makes & note it down and read it and then u'll see he is teaching hatred towards certain types of people its sad and evil. if you knew anything about psychology and propaganda ul c it

[786allahhuakbar]

@limegut 2 b honest i've also studied sceience and strategy @ 1 ov the best unis but my lecturers taught the unbiased truth. this lecturerer is spreading propaganda and brainwashing his students his non physics comments for example on government strategies, bullshit about anthropogeic climate change, i cud quote easily over 100 quotes from muller that r NOT subtantiated fact but merely wot he wants these student to belive which are BIASED against certain countries, certain types of people etc

[muhammadzahmad]

UC Berkeley should give credits to prof. Richard Muller...

[786allahhuakbar]

unforunatey people pls dont b fooled some of the shit he says is bullshit. he is a physics lecturer HE IS NOT speaking facts about everything els he includes in his lecture! look at the module title physics for future presidents his teaching them what he thinks they should believe if they were 2 b future presdients. sum of wot he says he myt believe cuz of shit he read in the media but dont believe everythin u hear even 4m a uni lecturer, the pyhsics is corect but double chek his otha statements

[limegut]

@786allahhuakbar This is a man hired by one of, if not the best public universities, and speaks without contradicting common sense or fact. "Physics for Future Presidents" means gathering many important physics concepts into one class without worrying about calculations. By looking at your comment, it appears that you do not realize this.

Please make your writing easier and more enjoyable to read in the future.

[derman077]

32:45

[Benjy2Delta]

This guy is a cool teacher, reminds me of Mr. Tait

[seadoosportster]

billion thanks! Muller is soooo good!

[Argibon]

lol the Plutonium Paradox half life theory. If you drop a penny, does it ever hit the floor? No, but I am sure we are half way there to understanding. :]

[terahba]

great looking 62 year old... that was the most suprising part of his lecture haha

[alexbulerias]

okay! I have aquestion after the part he said the concentration of radioactivity in the watch. (I don't have a watch, but I like to know anyways) I'm a guitarrist, so I need very healthy hands. would that much raioactivity mes my hand up?

[bibibibibiotip]

@alexbulerias you got it wrong, normally you don't get that much of radiation, it's far better to put importance into your nutrition, your physical activities and the level of your amplifier

[pucksterz12]

I like this professors' delivery. He makes it interesting and to the point without being dull and boring - thanks!

[aqouby]

Damnit man! Stop loosing your lazer!

[cymicamiyum]

@aqouby lol good 1, hee hee hee

[nullgeodetic]

Thank you very much UCBerkeley for your lectures!

@ccbnielsen We have no reason to believe otherwise since there is no evidence of the contrary. Anything other than that is religion: extra assumptions about reality, such as the existence of a soul independent of our bodies and the like (afterlife, reincarnation ...).

We are matter organised in a way that is aware of itself. Universe wondering about itself. Physics allowing for structures trying to figure out the laws of physics.

[MegaPeople45]

Thanks Berkeley!

[mophead319]

you can download MIT audio or video of lectures on iTunes. for free. I'm gunna die in college when i have to sit for lectures ha

[sparks444]

Irregardless of radiation, who the heck licks a paintbrush?

[SuperJoeOD]

such a great man .... i like his conceptual method

[ccbnielsen]

Hmm, it is funny to hear the same thing i have wondering for years, has been thought before. That thing he's talking around 42 min. Are we only atoms reacting to inputs outside the world?

[msk7046]

Does anyone have any QUIZZES or EXAMS from his course that they'd be willing to share with me? (NO! I'm NOT a student looking for past exams. As an Instructor, I'm interested in seeing how he phases/asks questions).

Thanks.

[sorileathegreat]

@msk7046 buy his book: Physics for Future Presidents.

[sorileathegreat]

@msk7046 The textbook, lol, there's two books. But, he does have questions at the end of each chapter.

[s0m3w0n2]

Phrases*

[msk7046]

Does it make you feel better to correct misspellings? I didn't know people need to feel as if they are under the spelling/grammar microscope when making a comment onlline!

[girocraz]

@msk7046 so, youre a physics teacher or lecturer?

[msk7046]

One of the best lectures I've seen

[mike900999]

muller i no that u most likely wont look at this but if u or a student look at this, please reply too my statment/questment

[onimotoko]

learn to spell before commenting.

[Cade57]

Did you not read the description of the channel? "stressing conceptual understanding rather than math"

[milkarton]

thanks for pointing that out for me, cade. i really do appreciate it. now shave your head and bang it against the wall.

have a nice day :-) kisses

[boxa888]

nikola tesla found that radiation is caused by the influence of cosmic rays hitting the dense neutron matter giving us the spectrum of electrons, broken matter and gamma rays. this is because the sun is the energy source giving off billions of volts enough to accelerate different matter till it gets smashed off dense neutron matter like uranium and things like that. its very interesting and would explain half life probabilities because cosmic rays are quite random in space!

[sn1pe352]

someone has been reading Tesla's DTOG :D

Hey Boxa888 You're one of the few people I know who ACTUALLY have learned teslas Real work (his theories based from the Vedic Sacred Sciences), ie, His DTOG

Please check out my page boxa888 , Its completely based on your statement above and Tesla's work,Russell's,Schaubergers, etc

[boxa888]

hey nice stuff, if you want to check out my tesla wireless energy system. i got a 20 ft wireless energy transmission with a high voltage in the reciever coil. its pretty awesome considering i dont have all the technology to get it perfect! maybe i can get 100 ft wireless industrial energy transfer, just come and check it out, they dont teach this science in school either lol

[mofogeezer]

yeah dont let the government find out or you'll dissapear.

[Thymonico]

Radiation, such as Beta radiation, isn't caused by cosmic rays though... It happens when a neutron converts to a proton (or when dq -> uq+e¨), and this happens even in completely isolated systems - so it happens randomly without influence. ;)

Tesla was a genius, altough his theories on radiation has been very much updated and improved.

And.. Sorry my ignorance, but... What's neutron matter and broken matter?

[boxa888]

neutron matter in the nucleaus(neutrons). the cosmic rays are charged to billions of volts from the sun and pass through most everything except neutrons in the nucleus of atoms cause target plates to bounce off of(like a giant xray vaccuum tube), allowing what we see as radiation,gamma, alpha beta, it shows why small pieces of matter can have so much radiation, it shows a better understanding of why radiation would occur for millions of years until halflifes happen because of random cosmic rays

[solarcradle]

lol "the social scientists understand people better than the physicists."

It's time to go back to farming! How about Mars?

[citizenschallenge]

{1/3}

Wonderful lessons.

Thank you UC Berkley & Professor Muller!

There is one comment I would like to make...

at 0:40:-- discussing atomic half life:

Prof. Muller says:

"Cutting it down to one atom.

"Will it decay or won't it

it's only a probability

"this is really strange"

[citizenschallenge]

Why? When we consider that its theoretical (in as much as new data will refine todays image) & mathematical models that you are describing. For instance, I imagine it is impossible to find any circumstance where youd wind up with a single atom by itself. Often I get the feeling science doesnt stress that science examines reality but science is restricted to discussing that reality in terms of the map. Not the territory! In doing that we loss a sobering sense of humility.

[citizenschallenge]

{3/3}

Given the general publics appalling disconnect with the scientific process

~ something that leaves them ill equipped to evaluate peoples claims ~

I think this is a fine point worth considering.

I think a big challenge for the truly smart folks,

~ like Muller, staff & students ~

is how to constructively counter faith-based non-thinking

that seems to be sweeping our country?

[squirrelbong]

huge thanks for the uploads UCB, great videos .. stumbled upon these and went 7 hrs straight. :D

[quarkphotonect]

The linear hypothesis is very pessimistic thats all I can say!!!!

[bricknuts]

Agreed. It was taught to me as the linear, non-threshold model. While I can certainly understand the drive to minimize risk, this model is akin to sani-wiping every solid surface you see before touching it

[quarkphotonect]

@bricknuts Yea agreed!

[TSALN]

Bombs? I love bombs! Got to get to LANL fast!

[Redsummr08]

What are carcinagins? (mushroom 50%)

[hopeariipusheinakuu]

Carcinogen - things that cause cancer, as in this case ex. is radiation

[SlykeThePhoxenix]

Pitty you can't see the bear being x-rayed. Good lecture though =).

[dirtchew]

The linear hypothesis is wrong if it requires more than one mutation to kick off any specific type of cancer.

[waperboy]

Hmm refuses to play anything past 40 minutes. Too bad, I was enjoying this.

[EliteSn1p3r]

that was like almost 67 minutes...past 40.

[waperboy]

What do you mean?

[EliteSn1p3r]

doesnt your video play past 40 minutes? i was just saying that there's a total of almost 67 minutes in the video (1:06:53).

[noey699]

equally** by the way

[noey699]

regarding the linear hypothesis at the beginning it cannot happen all the time at a certain rate because its a formation of a specific genetic mutation that makes it grow uncontrollably. It is just a possibility to cause that mutation, kind of like rolling dice... you cannot determine the exact threshold where each numbers of the dice will come up equal.

[sspoke]

thing is u could.. nothing is random not even rolling the dice.. it just determines where the radiation hits.

[Satspy]

@noey699: That's why it's called a hypothesis. If 25s will give you 100% cancer probability, you can make a SUPPOSED linear scale and assume that 2,5s will give you 10% cancer probability.

[sspoke]

OH... i get it.. but anyways.... the chances are not 10% .. more like the location where the sharpnel will hit.. and do the most damage to your DNA.. so 1% could be 1% or it could be 100% depending on the location you stand where the explosions occur.. percentages are over-rated in this type of atomic scale as you know the amount of explosions that happen I Believe atleast a few of them will hit u in bad places every couple of seconds.. it's all 100% to me..

[noey699]

Satspy yes, for general maybe statistical purposes you could say that. But what i am trying to get at is a linear scale is just too simple for something that complex. You have to consider the small scale, even at high quantities, and the gene it self, you have to hit it in just the right way to cause a cancerous mutation. Most of the cancerous mutations die within seconds because that single mutation kills the cell. So there is no way to give an exact percentage in this situation.

[quarkphotonect]

very very true

[Adkit2]

it's called "statistics".

[TomatoBreadOrgasm]

Here's what people do when scientists aren't sure yet: "YOU ONLY SURVIVED CUZ GOD WANTED YOU TO," or "Homeopathy works!" Anyway, I appreciate that Berkley is giving it away for free now.

[Dangerflamablesolid]

I LOVE THE INTERNET!!!!

I can learn forever for FREE!!!!

Thank you Berkley!

[coyler1736]

you should check out the "MIT ocw" as well if you like the free learning, it's also really good

ocw(dot)mit(dot)edu

[robberval]

I wonder what exactly he understands by Social Sciences. But I have the feeling that this guy is much better informed about Social Sciences than most social scientists. I guess you understand Social Sciences as an integrative approach to the people, humans, homo sapiens... piecing together the argument from a broader view... even appealing to our macaque origins, with the Anthropology...

[tank1357]

In response to the bit about half life: The idea is that the protons and nuetrons in the nucleus of an atom are always vibrating slightly. In a radioactive material, there is a chance that these particles will vibrate in just the right way as to break free from the nucleous, thus being launched as radiation. Of a mass of a substance, statistically speaking, after a period of time, half of that mass will have deteriorated. Its not that mysterious.

[Hippyy123]

umm no.

[sspoke]

umm yes.

[abram730]

great our troops are exposed to something worst then anthrax... wow.

[ynotbegoodtoall]

I love this instructor! He is such a terrific speaker, he is able to keep my attention no matter what I'm doing! I really look forward to more videos from Berkeley

[zetreque]

This is excellent online education for what it is. I have watched all of these lectures up to quantum mechanics so far and was just thinking of how he failed to touch on the sense of smell. I think it would be fascinating if he brought that up sometime during this course with his other stories and references to particle physics. (suggestion if anyone of relevance reads these comments.)

[flach99]

for the vbration of molecules in the smell receptors, and the ability to feel molecular vibration? its atoms he is talking about... :) although Al smells nice to me :)

[LilRedDog]

The throughput is terrible.. I have to buffer on pause and buffe for 10 minutes to watch.. I have no other problem with YouTube vids..

Is YouTube throttling this?

[abram730]

who is your ISP? I get great throughput.

[LilRedDog]

I found the problem, and it was my network.

[perspectual]

Another fascinating lecture by mullar, Giving away his age this time.