Can You Calculate Planck's Constant Without Knowing the Energy of the Particle?

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Homework Help Overview

The discussion revolves around calculating Planck's constant using given parameters such as stopping potential and threshold frequency, within the context of quantum mechanics and the photoelectric effect.

Discussion Character

  • Exploratory, Assumption checking, Problem interpretation

Approaches and Questions Raised

  • Participants discuss the relationship between stopping potential, threshold frequency, and energy calculations. There are attempts to apply the equation E=hf and considerations of kinetic energy in relation to stopping potential. Questions arise regarding the specific context of the problem, such as whether it pertains to Bremsstrahlung or the photoelectric effect.

Discussion Status

The discussion is ongoing, with participants exploring different interpretations of the problem. Some guidance has been offered regarding the need for a slope from a graph of stopping potential versus frequency, but there remains uncertainty about how to proceed without knowing the energy of the particle.

Contextual Notes

Participants note that they are not provided with the energy of the particle, which is a critical piece of information for their calculations.

admajoremdeigloriam
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if you are given the stopping potential and the threshold frequency, how do you calculate Planck's constant from it?
 
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HINT:Assume all the energy of the electron/accelerated particle is converted into an energy of the photon...


Daniel.
 
ive used E=hf
hf= Kmax + PHI
Kmax=eV

all it does is bring me round and round
 
Hold on a second.Are talking about Bremsstrahlung,or photoelectrical effect...?I though u meant the former,but apparently i was wrong.Usually there's the plot KE vs incoming photon's frequency and u find "h" from the slope...

Daniel.
 
we are given a graph of stopping potential (y-axis) vs frequency (x-axis) that's it
 
the stopping potential hits 0 at threshold frequency of 43.9 e13 Hz
 
Well,the stopping potential is

[tex]V=\frac{KE_{particle}}{q_{particle}}[/tex]

Either way,u need the slope of that line.

Daniel.
 
but we are not iven the E of the particle?
 

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