# Thread: Different amounts of energy for different light frequencies

1. I'm doing an experiment to see if higher frequencies of light produce higher amounts of energy on a solar panel.

My set up has a light shining on a solar panel (connected to a multimeter) with different colours of cellophane. After doing a test with red, yellow, green and blue cellophane, I found that Blue produced the most energy, followed by red, then green then yellow. Which goes against the hypothesis, which would expect the the order would be blue, green, yellow, red.

Then i thought that maybe the amounts of dye in the cellophane was unequal for each seperate colour, so I got a lightmeter and moved the light so that through the cellophane for each colour, the solar panel would recieve 2000 lux of light (is that the way it's said?), but even then, the order was blue, red, green, yellow.

Should I be getting these results, if not, what is going wrong??

Thanks!

2.

3. I'm pretty sure that you're getting the right results... Think about what comes just outside the visible spectrum of light.. infrared and ultraviolet. Which of those do you think will be higher in energy?? Then just figure out which of the colours are closer to the higher of these two on the spectrum, and which are closer to the lower one..

4. ok, ultraviolet is higher in energy, infrared lower, red is closest to infrared, and of the colours tested, blue is closest to ultraviolet, followed by green. If this is so, then why is red producing more energy than green???

Other factors i think may be affecting the result are that the energy created by solar panels is different for different frequencies, so maybe the one I'm using gets more energy from red than from others. Also, the dyes used in the cellophane may be impure, and in unequal portions across the different colours.

5. Yeah, something like that is probably the case, and sorry about the last post.. I misread your comment.. :S

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