The atmospheric division that lies directly above the stratosphere is the ______________
Fill in the blank(s) with correct word
mesophere
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On the autumnal equinox the Sun is
a. 23.4° north of the celestial equator. b. 23.4° south of the celestial equator. c. on the celestial equator and moving north with respect to the equator. d. on the celestial equator and moving south with respect to the equator. e. closest to the north celestial pole.
Why does the temperature of the gas between galaxies in galaxy clusters tell us about the mass of the cluster?
A) The temperature tells us the average speeds of the gas particles, which are held in the cluster by gravity, so we can use these speeds to determine the cluster mass. B) Temperature is always directly related to mass, which is why massive objects are always hotter than less massive objects. C) The temperature of the gas tells us the gas density, so we can use the density to determine the cluster's mass. D) The question is nonsense; gas temperature cannot possibly tell us anything about mass.
If the Moon rises exactly at sunset, what will its phase be? Why?
What will be an ideal response?
Light of the same wavelength passes through two diffraction gratings. One grating has 4000 lines/cm, and the other one has 6000 lines/cm. Which grating will spread the light through a larger angle in the first-order pattern?
A) the 4000-line grating B) the 6000-line grating C) Both gratings spread the light the same.