Questions from Modern Physics

Q: How many 131I atoms are administered in a typical thyroid cancer treatment

How many 131I atoms are administered in a typical thyroid cancer treatment? a. 4.2 * 1010; b. 1.0 * 1012; c. 2.5 * 1014; d. 3.7 * 1015.

Q: In the reaction that produces 123I, is there a minimum kinetic

In the reaction that produces 123I, is there a minimum kinetic energy the protons need to make the reaction go? a. No, because the proton has a smaller mass than the neutron. b. No, because the tota...

Q: Why might 123I be preferred for imaging over 131I? a

Why might 123I be preferred for imaging over 131I? a. The atomic mass of 123I is smaller, so the 123I particles travel farther through tissue. b. Because 123I emits only gamma-ray photons, the radia...

Q: Use Table 41.3 to help determine the ground-state

Use Table 41.3 to help determine the ground-state electron configuration of the neutral gallium atom (Ga) as well as the ions Ga+ and Ga-. Gallium has an atomic number of 31. From table 41.3:

Q: Which reaction produces 131Te in the nuclear reactor? a.

Which reaction produces 131Te in the nuclear reactor? a. 130Te + n → 131Te; b. 130I + n → 131Te; c. 132Te + n → 131Te; d. 132I + n → 131Te.

Q: What type of radioactive decay produces 131I from 131Te? a

What type of radioactive decay produces 131I from 131Te? a. Alpha decay; b. β- decay; c. β+ decay; d. gamma decay.

Q: The current–voltage characteristics of a forward­biased p-

The current–voltage characteristics of a forward­biased p-n junction diode depend strongly on temperature, as shown in the figure. As a result, diodes can be used as tempe...

Q: The sensitivity of a diode thermometer depends on how much the voltage

The sensitivity of a diode thermometer depends on how much the voltage changes for a given temperature change, with the current remaining constant. What is the sensitivity for this diode thermometer,...

Q: Which statement best explains the temperature dependence of the current–voltage

Which statement best explains the temperature dependence of the current–voltage characteristics that the graph shows? At higher temperatures: a. The band gap is larger, so the electron– hole pairs ha...

Q: a. For the sodium chloride molecule (NaCl) discussed at

a. For the sodium chloride molecule (NaCl) discussed at the beginning of Section 42.1, what is the maximum separation of the ions for stability if they may be regarded as point charges? That is, what...