A sample of ideal monatomic gas is cooled by 50.0 C° at constant volume by removing 831 J of energy from it. How many moles of gas are in the sample? (R = 8.31 J/mol ? K)
A) 2.50 mol
B) 1.50 mol
C) 1.33 mol
D) 1.00 mol
C
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As the moon covers the solar disk during a solar eclipse, a flash spectrum of the sun's chromosphere can be recorded. This flash spectrum reveals an emission spectrum and provides information on the properties of the chromosphere. As the moon moves from the inner chromosphere to the outer chromosphere, the spectral lines present in the flash spectrum change. What is going on in the chromosphere
that produces the changes in the flash spectrum? I. The temperature of the chromosphere decreases as the distance from the photosphere increases. II. The temperature of the chromosphere increases as the distance from the photosphere increases. III. The density of the chromosphere decreases as the distance from the photosphere increases. IV. The density of the chromosphere increases as the distance from the photosphere increases. a. I & III b. I & IV c. II & III d. II & IV e. I
Perigee is the point in ____
a. the Moon's orbit when the Moon is farthest from Earth b. an object's orbit around Earth when the object is closest to Earth c. an object's orbit around Earth when the object is closest to the Sun d. a planet's orbit when the planet is closest to its sun e. a planet's orbit when the planet is farthest from its sun
The Ptolemaic model has planets moving in
A) elliptical orbits about the Sun B) a simple circle about the Earth C) a simple circle about the Sun D) small circles, the centers of which move in a larger circle about the Earth
A typical source of infrared radiation is
A) magnetized particles vibrating in iron and certain other metals. B) charged particles moving within the nucleus. C) electrons moving along a metal antenna. D) thermal vibrations of molecules. E) electrons orbiting the nucleus in atoms.