Physics
1st Edition
ISBN: 9780133256925
Table of contents
Textbook solutions
All Solutions
Section 26.4: Fundamental Forces and Elementary Particles
Exercise 39
Step 1
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Leptons are elementary particles.
Hadrons are not elementary particles. They are made up of either two or three quarks.
Result
2 of 2
Leptons
Exercise 40
Step 1
1 of 2
Hadrons (Mesons and Baryons) are made up of combinations of quarks.
Mesons are made up of two quarks.
Baryons are made up of three quarks.
Result
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Hadrons
Exercise 41
Step 1
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Baryons are made up of three quarks.
For example proton (p) is a baryon. It is made up of two up quarks and one down quark ($uud$) so that its charge is $+dfrac{2}{3}e +dfrac{2}{3}e -dfrac{1}{3}e = +e$
Mesons are made up of two quarks.
Pion ($pi^+$) is made up of up quark and the antiparticle of down quark ($ubar{d}$).
Result
2 of 2
See Solution.
Exercise 42
Step 1
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Weak nuclear force is stronger than the force of gravity.
The relative strength (relative to strong nuclear force) of weak nuclear force is $10^{-6}$ whereas the relative strength of gravitational force is $10^{-43}$.
Result
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Weak nuclear force
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