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.
C) hotter and denser than the surface.
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At a particular instant, a proton moves Eastward in a uniform magnetic field that is directed straight downward. The magnetic force that acts on it is
A) to the South. B) zero. C) directed upward. D) Northward. E) Westward.
The number of cycles of a periodic process that occur per unit time is called
a. amplitude. b. frequency. c. period. d. wavelength. e. speed.
The laws of thermodynamics can be related to the following: (i) the measurement of temperature, (ii) the lowest temperature possible, (iii) conservation of energy, and (iv) only part of heat energy available may be turned into work. Which of these involve the zeroth and third law?
a. (i) and (ii) b. (ii) and (iv) c. (i) and (iii) d. (iii) and (iv)
Which of the following was not a part of Dalton's atomic theory?
a. Each element is composed of atoms, which are identical for that element. b. The reactivity of elements involves changes in their electron configuration. c. Chemical combination is the bonding of a definite number of atoms of each of the combining elements. d. No atoms are gained, lost, or changed in identity during a chemical reaction.