The proton-proton chain
a. combines two hydrogen nuclei to produce a single helium nucleus and energy.
b. splits a helium nucleus to produce 4 hydrogen nuclei and energy.
c. is the mechanism that increases the temperature between the photosphere and corona of the Sun.
d. is the interactions between protons in Earth's atmosphere that produces auroras.
e. produces energy in the core of the Sun in the form of gamma rays, positrons, and neutrinos.
e
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Half-frozen fruit punch is always sweeter than the same fruit punch completely melted because
A) the sugar sinks to the bottom. B) crystallization is a purifying process. C) the half-frozen fruit punch is warmer. D) sugar molecules are less soluble in a half-frozen solution.
A lunar month is about 28 days. If the Moon were closer to Earth than it now is, the lunar month would be
1) less than 28 days, 2) more than 28 days, 3) still 28 days, mainly because 4) centripetal force would lessen with decreased distance. 5) a closer Moon means an increase in both gravitational force and speed, which in a smaller orbit means shorter time. 6) orbital speed about the center of mass of Earth-Moon system is not dependent upon the distance between Earth and Moon. 7) of tidal friction.
At what temperature would the root-mean-square speed of hydrogen, H2, molecules equal 11.2 km/s (the earth's escape speed)? The mass of a hydrogen atom is 1.67 × 10-27 kg, and the Boltzmann constant is 1.38 × 10-23 J/K
A) 1.01 × 102 K B) 1.01 × 104 K C) 1.01 × 106 K D) 1.01 × 108 K
One difference between a microscope and a telescope is that the image formed by the objective is
A. real for the microscope but virtual for the telescope. B. virtual for the microscope but real for the telescope. C. real for both, but the image is enlarged for the microscope and reduced for the telescope. D. real for both, but the image is reduced for the microscope and enlarged for the telescope.