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http://lectureonline.cl.msu.edu/~mmp/kap28/PhotoEffect/photo.htm As you change the wavelength, it changes the current produced, which is wrong isnt it? Current is only reliant on intensity

I actually do remember the third derivative thread and remember thinking it was kind of slack the markers cant recognise valid methods. You would expect though that if a marker saw a method he didnt know, he'd ask senior markers??

George W. I hate to say this but I think you'rw wrong, intensity is purely the flux of photons, its independant to frequency

Oh really? Are you sure? Dont meen to sound cynical, but isn't the intensity just the amount of photons given off?

Yep, so different colours at same frequency will have same reading on the data logger, because it measures current, right?? Sweet

You dont have a textbook or access to google.com? quite simply they amplify a current

Is it true to say, that if you had a photoelectric probe on a data logger and compared lights of varying frequncy but same intensity, the current should be same, assuming the work function of the probe is below the lowest frequency colour you use

Sorry, thats what I meant, but once you prove their intersection lies on the director circle, is that enough to satisfy a marker?

Do you think it is ok to quote 'because they lie on the director circle' or does it need to be proven

How would you show that SG and ST are perpindicular CMtutor? ALso could you goto the extracirricular thread and look at my directors circle thread, is that what you'd use in this example?

you shoudlnt have any secs in your working I have done this one so heres some stuff to do: Find where G is, find where T is, (draw a diagram for clarity) find GT, which is just G-T because theres no x values (on the y axis) If the circle lies on GT, and has diameter GT, it meens the centre...

it has the auxilery circle not the director circle

Find the tangent and normal at P, then find their y intercept (sub x=0), then use distance formula to get distance between those two lines, then use that distance as a diameter of a circle, x^2 + y^2 = r^2, then sub in the focii points (+-ae,0) and show they satisfy the circle equation

I can't find shit on it on google :(

how do you use it

I am not sure how you construct a conic with it, it came up in fitzpatrick, 32(c), question 8, proving that tangents from a chord of contact lie at right angles, in the worked solutions, and we dunno what a director circle is

It will involve a data logger w/ photo cell, I know that

We will be given a random prac to perform that is based around that ^^ You see the thing is, I dont know that our school has photovoltaic cells

'Perform a first hand investigation demonstrating the photoelectric effect' What wonderful experiment shall we be presented with on the day of this test? Any guesses?

Our maths teacher says he doesnt know it, so he wouldnt be confident teaching it, so can someone here explain it