Questions from Modern Physics


Q: The atomic mass of 12 25

The atomic mass of 12 25

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Q: The polonium isotope 84 210

The polonium isotope 84 210

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Q: a. Can you show that the orbital angular momentum of an

a. Can you show that the orbital angular momentum of an electron in any given direction (e.g., along the z-axis) is always less than or equal to its total orbital angular momentum? In which cases woul...

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Q: The radiocarbon in our bodies is one of the naturally occurring sources

The radiocarbon in our bodies is one of the naturally occurring sources of radiation. Let’s see how large a dose we receive. 14C decays via β- emission, and 18% of our bo...

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Q: A neutral pion (π0) has a mass of 264 times the electron mass and decays with a lifetime of 8.4 * 10-17 s to

A neutral pion (π0) has a mass of 264 times the electron mass and decays with a lifetime of 8.4 * 10-17 s to 

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Q: Calculate the mass defect for the β+ decay of 6

Calculate the mass defect for the β+ decay of 6 11

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Q: A person ingests an amount of a radioactive source that has a

A person ingests an amount of a radioactive source that has a very long lifetime and activity 0.52 µCi. The radioactive material lodges in her lungs, where all of the emitted 4.0-MeV α particles are a...

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Q: In 1952 spectral lines of the element technetium-99 (99Tc

In 1952 spectral lines of the element technetium-99 (99Tc) were discovered in a red giant star. Red giants are very old stars, often around 10 billion years old, and near the end of their lives. Techn...

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Q: A 70.0-kg person experiences a whole-body

A 70.0-kg person experiences a whole-body exposure to α radiation with energy 4.77 MeV. A total of 7.75 * 1012 α particles are absorbed. a. What is the absorbed dose in rad? b. What is the equivale...

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Q: Measurements indicate that 27.83% of all rubidium atoms currently

Measurements indicate that 27.83% of all rubidium atoms currently on the earth are the radioactive 87Rb isotope. The rest are the stable 85Rb isotope. The half-life of 87Rb is 4.75 * 1010 y. Assuming...

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