Bohr model radii (derivation using physics) | Chemistry | Khan Academy

[@Diya-kb5uv]

Pls continue making these videos......all of my education literally comes from ur videos......

[@SupiSiki]

These lectures make this so clear. They have been very helpful in reviewing my college chemistry. One question: The r vector in the calculation of angular momentum (r X p) stands for what? The radius?

[@nishit7147]

Gregory Rummo yes.

[@pxnishant]

just in case anyone has this doubt, the R is a position vector of the particle from the point about which you want to find the angular momentum

[@SwarajPatel99]

Thanks for the video, really helpful

[@sivakamialagappan8235]

You're The god for me pls upload more videos about quantum theory

[@m.r.f.yamnavlog2643]

Thanks a lot

[@orchoose]

i came for the physics>D

[@Paradox586]

orchoose same

[@VaideeshVarthanam-o3w]

Same

[@anshulraman4503]

How did bohr came up with mvr = nh/(2*pi)

[@orchoose]

its postulate based on planck constant

[@randyrichardson6953]

The wavelength of an electron is: *λ = h/p* But _p_ in this case is the angular momentum, so the above equation can be rewritten as: *λ = h/rmv* Solving for _rmv_ gives: *rmv = h/λ* In the Bohr model, the electron's wavelength is 2π, since it has a circular orbit. So: *L = rmv = h/λ = h/2π* As for the *n* term, this is just some integer. Momentum is quantised and must therefore be a multiple of Planck's constant.

[@LightInTheNight1337]

Randy Richardson If λ=h/p, then λ=h/mv, but you have λ=h/rmv. How?

[@naharkhan7756]

@@mdiogo610 can anyone you describe that how ♢E=(E2-E1)= hu

[@abenphilip4283]

@@naharkhan7756 If you still have any doubts regarding this feel free to ask. All the best Regards AP

[@mayankupadhyay1553]

I am a 9th grader and im able to understand thisHats off to u man

[@guyincognito7979]

i'm 15 and i love this i am going to study physics

[@beaupersoon5221]

same bro

[@LightInTheNight1337]

I am 3 years old and I watch 10 of these videos at the same time at 2x speed.

[@aapnegara]

Holy shit i'm 19 years old hahahaha

[@dogdogdogdogdog2546]

I am an embryo and I watched all of these videos in 0.69 seconds and then unlearned everything just to learn it again becuase I don't like Hitler.

[@wellusee]

Well done.

[@orchoose]

Can someone elaborate on why is there rest mass of el.? is it because mass is function of velocity whan you express centrifugal acceleration?

[@nishit7147]

?

[@kausikkar2587]

Electron has a rest mass of zero.

[@orchoose]

@@kausikkar2587 Same as your brain.

[@swathynatarajan5560]

Brilliant derivation. But what exactly is k?

[@adamurmos9270]

k is Coulomb's constant. It is generally expressed using E0 [epsilon-nought] which is the permittivity of free space. E0 = 8,85*10^-12 F/m. And k = 1/4pi*E0 Nm^2/C^2, so it is just another constant. Makes long derivations like this much more convenient.

[@saptakmukhopadhyay5759]

K=1/(4×22÷7×epsilon nought)

[@oussamagouaiche4778]

thanks

[@AzulaOTP]

Why do I get 8.5 * 10^-30 ?

[@aminshams265]

How intelligent bohr was!

[@kausikkar2587]

Indeed!

[@sillysiblings7317]

But he was prooved wrong later by Heisenberg 😪

[@arushnandhan5226]

why r m v = n x [h/2π ] ??

[@kausikkar2587]

L= mvr is an obvious equation for the angular momentum. But Bohr also postulated that the electrons moving in an orbit has a momentum of nh/2pi.

[@mortuosdocerevivos]

Why sin???

[@syedifraz2674]

I can't solve the equation please help

[@bismuth8323]

It's been 4 years, have you solved?

[@kausikkar2587]

This is easy dude. The the electrostatic force equation, divide it by the angular momentum and you get the equation.

[@adekanyedayomoses5345]

Prove total energy of an atom

[@gamerzamer5483]

so the answer is c=m1

[@rangarik9492]

Your are not using any units.....What a shame.

[@kausikkar2587]

We do not use units in derivation brother.

[@saishiva8627]

where is z genius. atomic number

[@mohamadnihaad2055]

NAZGUL DARK KNYT bohr model is for h atom z for h is 1

[@abenphilip4283]

@@mohamadnihaad2055 exactly...

[@umamaheswaris8750]

Bet you feel, pretty stupid right now.

[@sherinemarshal7375]

Not my stuff

[@juliaketelhut7816]

blaaahahahaha

[@kausikkar2587]

Nothing to laugh.