many thanks, collinsmark, you have helped me a lot on this. i think i should have used this a long time ago. you are so helpful, maybe i can use this site for more labs next time :)
i just graphed the frequency vs potential, it looks linear. but i still don't know how Planck's is used here
edit: i some person on FB told me that "energy of light is E=hf. The energy loss of electrons is E=qV as they pass the voltage difference in the LED. Combine the equations and use the...
thanks collinsmark,
c=3x10^8
i asked my friend, he said that the peak on the graphs, like the point with the highest point on the graph is the intensity. like the peak for intensity for purple is 0.7, and the wavelength at 0.7 is ~412nm. does that mean that the wavelength is 412nm? he then said...
so i have to do this lab for ib physics and i am a noob at physics and i am having some trouble with the lab that i have to do.
Homework Statement
the research question is "how does potential difference needed to operate an LED depend on the frequency of the light emitted?
it is set up in...