Which of the following statements about ?+ decay are correct? (There may be more than one correct choice.) During ?+ decay
A) an orbital electron is captured by the nucleus.
B) a proton is emitted from the nucleus.
C) a neutron in the nucleus decays to a proton and an electron.
D) a proton in the nucleus decays to a positron and a neutron.
E) the atomic number Z of the isotope increases by one unit but the atomic weight A remains unchanged.
Answer: D
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The arrangement is composed of four 6.0 mF capacitors. What is the capacitance of the combination?
A. 24.0 mF
B. 4.5 mF
C. 8.0 mF
D. 9.0 mF
E. 12.5 mF
This diagram shows the approximate depths to which different wavelengths of light penetrate Earth's atmosphere. Why does it show an airplane?
A) Much of the infrared spectrum can be observed from an airplane that flies above most clouds. B) Airplanes are useful for astronomical observations at all wavelengths of light that do not reach the ground. C) Telescopes on airplanes are better than telescopes on the ground for both visible-light and infrared observations. D) The airplane is just decorative, indicating that astronomers use airplanes to fly to ground-based observatories.
The principle of continuity states that for fluid flow to be continuous it must
A) speed up in narrow regions of flow. B) slow down in wide regions of flow. C) both of these D) neither of these
Which of the following does quantum theory agree with?
A) Microscopic particles, rather than the macroscopic world, form the fundamental reality. B) Future events are entirely predetermined, or predictable. C) It is possible to analyze physical phenomena and physical systems by separating them into their component parts and studying those parts individually. D) All of the above. E) None of the above.