Chapter 45605P45.32(a)EI=10 0. eV is the energy required to liberate an electron from a dynode. Let nibe thenumber of electrons incident upon a dynode, each having gained energy eV∆afas it wasaccelerated to this dynode. The number of electrons that will be freed from this dynode isNneVEiiI=∆:At the first dynode, ni=1andNe11110010 010==af afVeVelectrons..(b)For the second dynode, nNi1110,soNe2121010010 010().VeV.At the third dynode, i2210andNe3231010010 010.VeVaf.Observing the developing pattern, we see that the number of electrons incident on theseventh and last dynode is 76610.(c)The number of electrons incident on the last dynode is n7610=. The total energy theseelectrons deliver to that dynode is given byEnei−=∆af107006001068V VeV.P45.33(a)The average time between slams is 6038 1 6minmin=.. Sometimes, the actual interval isnearly zero. Perhaps about equally as often, it is 2 1 6×. min. Perhaps about half as often, it is416×. min. Somewhere around 51680×=..minmin , the chances of randomnessproducing so long a wait get slim, so such a long wait might likely be due to mischief.
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