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Physics question about photomultipliers.?
Consider a photomultiplier tube with 10 dynodes kept at a constant potential difference of 300 volts. The electrodes are coated with a material that has a work function of 2.70 electron volts. Calculate the total number of electrons N collected by the anode when a single photon of wavelength 400 nanometers strikes the cathode.
I need help on this question please.
Thank you.
A 400nm photon has an energy of hc/L= 6.67E-34 x 3E8/4E-7=5.0025E-19 joules=3.13eV. So it releases just 1 electron. The cascade from the 10th dynode contains(300/2.7)^10=2.87E20 electrons.
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