Stopping potential vs frequency graph | Dual nature of light | Physics | Khan Academy
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- เผยแพร่เมื่อ 21 ก.ค. 2024
- Let's explore how the graph of stopping potential vs frequency can be used to calculate the Planck's constant experimentally!
From Einstein's photoelectric equation, this graph is a straight line with the slope being a universal constant. This slope has the value of h/e. In an effort to disprove Einstein, Robert Millikan conducted experiments with various metals only to conclusively prove him right. Millikan, Einstein, and Max Planck, all won a Nobel prize for their contribution to photoelectric effect and giving birth to the quantum nature of light!
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Created by Mahesh Shenoy
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I never had this much fun while watching a physics video, this man is seriously great
It’s chem
Einstein got lucky everyone else proving his equations😂
In the end I thought Millikan was odd out of Nobel Prize!!!
Millikan got Nobel for somethin he didn't believe in
🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣
😂 🤣🤣
Just amazed by your explanation!!!
My doubts were clear instantly! Thank you sooo muchhh!
This channel is a life saver
Awesome ..nice explanation. Thank you
Awesome explanation ☺
Thanks a lot
Very advanced teaching. Nice 👍
You are just awesome! I was having goosebumps listening to Robert Millikans story😂
Super amazing
physics seems very interesting
This is chemistry 😂
Love your video
How do you calculate Plank's constant from that graph
Find y intercept then multiply by electron charge and then divide this number by the threshold frequency.
Calculate tan theta by y axis/x axis
What is the significance of slope being constant ?
you know, different elements have different positive charges, so the rate at which voltage needed to stop electron should have been different,but its also easy to understand why slope must remain constant: as all metals having different work functions,still must abide by energy conservation,so its only natural to understand why all graphs must be parallel,if not it would ne like I input alot of energy but require alot less voltage to stop or vice versa
so both can be understood as valid but the latter is way more logical, the reason milikan ig considered this odd was due to personal bias, as in, just think about it yourself,when you come across such an equation at face value you would immediately consider different materials having different rates of change
this congruency of rate of change in enery in linear graph is also the reason why Plank's constant is so detrimental, it shows all factors depending "on" energy like motion and frequency connect to one another some way or the other
People listen s u during lockdown makes weard
Einstein’s me and milikan’s my friends
Einstein be like: thnx for proving i won noble prz
Super explain
This is what we really call *Wasted in some sense*
Nice explanation
Thank you
without watching I am sure this video is amazing.....😀👍
Hyach 😅
😂
Hindi me bol angrez ki allad
English seekh ke anpad ka jhaant
Hindi channel mein jaa Hindi medium ki aulaad
Sorry but true
Hindi me samaj aata he
nhi humko English me bhi Ata hai 🤗💀
try physics wallah