12.07.2015 Views

Simple Nature - Light and Matter

Simple Nature - Light and Matter

Simple Nature - Light and Matter

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16 [See section 0.2 for help on how to do order-of-magnitudeestimates.] Suppose you are holding your h<strong>and</strong>s in front of you, 10cm apart.(a) Estimate the total number of electrons in each h<strong>and</strong>.(b) Estimate the total repulsive force of all the electrons in one h<strong>and</strong>on all the electrons in the other.(c) Why don’t you feel your h<strong>and</strong>s repelling each other?(d) Estimate how much the charge of a proton could differ in magnitudefrom the charge of an electron without creating a noticeableforce between your h<strong>and</strong>s.Key to symbols:easy typical challenging difficult very difficult√An answer check is available at www.light<strong>and</strong>matter.com.Problems 507

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