In the GUT, electromagnetism and the strong nuclear force are the last to appear
Indicate whether the statement is true or false
FALSE
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What do we mean by the star-gas-star cycle?
A) It is the continuous recycling of gas in the galactic disk between stars and the interstellar medium. B) It is the idea that stars in close binary systems can exchange gas with one another. C) It is the set of nuclear reactions by which heavy elements are produced in the cores of massive stars. D) It describes the orbits of the stars and interstellar medium around the center of the galaxy.
In order to measure a spectral line from an atom at one particular frequency, ________.
A. that frequency must correspond to one particular electron transition in that atom B. that spectral line must be in the visible part of the electromagnetic spectrum C. that frequency must not create an excited state in that atom D. the line must be as wide as the distance between two orbitals
Which of the following statements about Earth's troposphere is not generally true?
A) It is the lowest layer of the atmosphere. B) It is the layer of the atmosphere in which convection plays the most important role. C) It is the layer of the atmosphere in which ozone absorbs dangerous ultraviolet light from the Sun. D) It is a layer of the atmosphere in which temperature declines with increasing altitude.
The planet Earth
a. has retrograde motion. b. is the closest planet to Venus. c. is the smallest of the terrestrial planets. d. has a unique circular orbit.