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) they ask for an "amount" of charge, but electronsare negatively charged... and they it says to "watch the sign". Alittle confusing. I will assume they want the answer as a negativeamount of charge. .    charge = current * time = -3.50 C/s * 95% * 15 s   =    -49.88 Coulomb of charge reaches the anode in 15 s . (b)   number of electrons = -49.88C *   1 electron / -1.60 x 10-19 C = .            =    3.117 x 1020 electrons . (b)   number of electrons = -49.88C *   1 electron / -1.60 x 10-19 C = .            =    3.117 x 1020 electrons

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