Qualification > Sciences
Edexcel PHYSICS Doubts
Darth Austrakast:
--- Quote from: wakemeup on June 04, 2010, 03:32:07 pm ---I'm not sure what 'stopping potential' and 'saturation current' mean so I assume you want to know what will happen to the current and the potential difference. The more you increase the frequency above the threshold value, the more kinetic energy (1/2mv^2) electrons gain. So, both the current(I=nave) and potential difference(V=W/Q) will increase.
As for absorption spectra, we're basically supposed to know that different objects absorb light differently. They all absorb specific frequencies of light. That's why you see dark parts on the absorption spectra. These are the frequencies of light that have been absorbed by the object in question. This and the photoelectric effect both provide evidence for the particle nature of light.
Hope I helped.
--- End quote ---
hey thanx that helped a lot !
yeah stopping potential is voltage and saturation current is the maximum current after which the photocurrent does not increase
Sweet_03:
can anyone plz explain how to do Question 21 (c)(ii)
from June 2009 !
Saladin:
--- Quote from: Sweet_03 on June 05, 2010, 03:29:52 pm ---can anyone plz explain how to do Question 21 (c)(ii)
from June 2009 !
--- End quote ---
On it now.
Saladin:
Just use V=lA
Then use V=IR as the current stays the same!
Ibiza279:
i need notes for nature of light, mainly the particle theory and the wave theory cause i don't get it :(
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