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Exam 12: Special Relativity and Elementary Particles

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Question 41

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Since the rest energy of an electron and its antiparticle a positron is 0.511 MeV, a gamma ray must have an energy larger than 1.022 MeV to produce an electron-positron pair.

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Question 42

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The spin of elementary particles is quantized.

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Question 43

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The top quark

Because of the equivalence of energy and mass, a gamma ray, which is a high energy photon, can "disappear," and in its place there will be produced an electron and a positron, which both have mass.

The quark structure of the neutron is udd.

There are three flavors of quarks.

When it comes near a heavy nucleus, a gamma ray, which is a high energy photon, can "disappear," and in its place there will be produced an electron and a positron, which both have mass. According to special relativity, this pair production is an example of __________.

What is the quark structure of a neutron?

What is the mass of an electron in MeV/c ²?

All quarks have 1/3 the electric charge of an electron.

A __________ has integral spin.

Charm, beauty, and truth are three quantum numbers for quarks.

It takes approximately ___________ seconds for a particle moving at the speed of light to travel the 150 million kilometers from the Sun to Earth.

Special relativity predicts that moving clocks run slow.

The __________ binds quarks together.

What is the quark composition of the strange Κ⁺ meson?

Quarks are held together by the color force. Electrons are made of quarks.

A particle with a half-integral spin is a

The strong force depends upon the electric charge of the particles involved.

Which of the following is considered anitmatter?