Qualification > Sciences
Edexcel PHYSICS Doubts
ABF:
thank you...
Darth Austrakast:
I have a doubt from nature of light topic
In an experiment with photoelectric emitter if frequency of incident electromagnetic radiation is increased
wat will happen to the stopping potential and saturation current? can n e 1 plz explain y?
thanx !
and another question what do we have to know from absorption spectra?
Igcseboy:
hello
does anybody has some good notes on Waves....... i need them urgently...
some notes on electricity and nature of light will appreciated...
wakemeup:
--- Quote from: Darth Austrakast on June 04, 2010, 06:30:25 am ---I have a doubt from nature of light topic
In an experiment with photoelectric emitter if frequency of incident electromagnetic radiation is increased
wat will happen to the stopping potential and saturation current? can n e 1 plz explain y?
thanx !
and another question what do we have to know from absorption spectra?
--- End quote ---
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.
wakemeup:
--- Quote from: Igcseboy on June 04, 2010, 10:59:27 am ---hello
does anybody has some good notes on Waves....... i need them urgently...
some notes on electricity and nature of light will appreciated...
--- End quote ---
You might find this useful. Some stuff is not in the course but it's good revision nevertheless
http://www.slideshare.net/pburgess/edexcel-as-physics-waves-presentation
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