In a Crooke\'s Tube, a stream of electrons boils off a negativeelectrode, or cat

Question

In a Crooke's Tube, a stream of electrons boils off a negativeelectrode, or cathode, and flies through a vacuum toward a positiveelectrode, or anode. Often, the anode is given a distinctive shape,like a cross, so that the electrons that miss it and fly past willcreate a dramatic shadow on the far end of the glass tube. Thestream of electrons is flowing past a certain point between thecathode and the anode at a rate of 3.50 A. If 95.0% of theelectrons reach the anode, (a) what amount of charge reachs theanode during a period of 15.0 s? Be careful of the sign ofyour answer. (b) How many electrons reach the anode during a periodof 15.0 s?

Explanation / Answer

a) dQ=Idt Q = -3.50A * 15s = -52.5C Note the current is negative as electrons carry negativecharge. 0.95Q = -49.875C b) -e = -1.602176*10^-19C Therefore the total number of electrons is equal to the ratio of0.95Q/-e 0.95Q / -e = 3.113*10^-20

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