Radioactivity, Half-Life & Inverse Square Law - GCSE & A-level Physics (full version)

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00:00 Decay constant
01:49 Half life
08:10 Decay equation derivations
14:24 Intensity & inverse square law -
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[ericsonofjohn]

If you’re not doing maths a level but are doing physics, you have my sympathies

[AndrewThomas]

your probably single handedly the reason why i'm not failing physics btw

[taladiv]

Your mathematic explanation about deriving the decay formula was clear and helpful. Thank you.

[dulapiip]

Today is the 6th of Jan, 1am. My A levels are this month, first exam ph4 is on 7th and ph5 on 16th(with other exams in between). I didn't finish ph4 particle physics & capacitors even two days before, but watching your vids i finished them all and am prepared for the exam tomorrow. watching Ph5 now because that's in shit shape as well but im fixing things up and your vids are 60% of the reason why i can. Man, bless you and thank you. You're saving lives here.

[FaraisWorld]

These Videos are literally saving my A level. Thank you very

[Yeneney]

This was actually ridiculously helpful THANKS SO MUCH!

[afrokaioty]

Thanks for making great videos, you’re the reason I got a grade 1 in Unit 1 CAPE, unit 2 exams are coming up!

[amanamin]

I take maths and the maths in physics was always troubling me, mainly cuz we have alot of non math students in our class and it makes sense we don't study derivation of many equations, thx alot for this video, cleared up alot of things

[mussaratjabeen]

Thank you so much. You are so good. Thank you for saving my life

[zekion.]

Thanks a lot dude, this saved my O levels!!

[shahmirmohammad]

You helped alot but I got sleeping watching this

[gecko]

Thanks mate, needed the equations that aren’t on the equation sheet

[ferenczhucker]

PCN level 2 radiography exam, brings back some memories, also the headaches, 😂 😂 😂

[Ben-wmcm]

every time he says source, i hear sauce so i just imagine eating alpha and beta radiation sauce 😂

[fibraaa]

your videos are the best but what about nuclear radius and nuclear density?

[hadiatariq]

thankyou they r very helpful but the sound of sharpi rubbing on paper is VERY itchy please change the pen if possible

[kran]

at about 16:00 why is the area of the curcle 4Pir^2? I feel stupid snd thst it should be obvious but its really annoying me and I can't figure it out

[asifirfan]

what is the difference between activity and count rate?

[quantumfellow]

the only thing I can think of to add is in the definition of a half life is its the mean time taken for activity of an isotope to halve, right?

[eddieestcourt]

How do u work out the radius of a nuclei? isnt it in the exam