How can a nucleus be described by particular values of A, Z and N when the mass of the nucleus is not equal to Zmp + Nmn, where mp and mn are the masses of free protons and neutrons?
a. A, Z and N have no intrinsic meaning.
b. A, Z and N describe the number of particles of given types, but mass has no meaning when part of the mass is elsewhere in the universe. c. A, Z and N describe the number of particles an ideal rather than a real nucleus would have. d. A, Z and N describe the number of particles of given types in the nucleus, but not their masses in a bound state. e. A, Z and N describe the number of particles of given types in the nucleus since the missing mass consists of electrons that are also present in the nucleus.
D
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The core of the Sun is
A) at the same temperature and density as the surface. B) at the same temperature but denser than the surface. C) hotter and denser than the surface. D) constantly rising to the surface through convection. E) composed of iron.
Democritus believed that everything that is real is made of atoms. Are electromagnetic fields physically real, and are they made of atoms?
A) Electromagnetic fields are made of atoms, but atoms themselves are not physically real and thus electromagnetic fields are not physically real. B) Electromagnetic fields are made of atoms, but are not physically real because they are nothing but the motions of these atoms. C) Electromagnetic fields are physically real, although they are not made of atoms. D) Yes, electromagnetic are physically real, and they are made of atoms. E) No, electromagnetic fields are not physically real, and they are not made of atoms.
The characteristic peaks in an x-ray spectrum of an atom occur because
a. of photon absorption. b. of the photoelectric effect. c. electrons in the atom make transitions to lower energy levels. d. of the uncertainty principle. e. of rapid deceleration of the bombarding electrons.
An airplane flying with a constant speed flies from a warm air mass into a cold air mass. The Mach number (the ratio of the speed of the airplane to the speed of sound) will:
a. increase. c. stay the same. b. decrease. d. become unstable.