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 reaches 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

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 reaches the anode during a period of15.0 s? Be careful of the sign of your answer. charge=q=current*time=95/100 *3.5*15=-49.875C (b) How many electrons reach the anode during a period of15.0 s? charge=q=number of electrons(n)*basic charge(e)              =n*1.6*10-19 49.875C=n*1.6*10-19 so n= 49.875/1.6*10-19=31.171875*1019

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