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Homework Statement
investigate how output from photocell depends on distance from infrared point source
am required to design a labratory experiment to investigate how the output from a photocell depends on its distance from a point source of infrared radiation.
i am proposing my idea and i want ur comments on it
ermm i wud connect a photocell in series with an ammeter with a voltage meter. The photocell/ LDR/ Photodiode watever u call it, wud be directly pointed toward my light source. Therefore my circuit wud have a change in resistance wen my light source hit the LDR or a photocell. Using that information i cud vary the distance and obsevre the difference in resistance and therefore the strenght of my signal. i wonder if it s possible to calculate number of photons hitting my LDR?
The experiment wud be performed in a dark room and with safety google due to the dange of infrared light.
my thought on this experiment wud be since light diffract sometimes therefore the amount of photons hitting my LDR wud varied with the distances. Yet the question said how the output from a photo cell depends on its distance from a POINT SOUCE of infre-red radiation, so i have doubt whether it wud diffract a substantial amount or not due the confusion caused by the wording of the question. Nevertheless, that s my simple plan at the moment and i wud be really gratefull if some1 cud spot any wrong doing in my ignorant planning
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