During the Kelvin-Helmholtz contraction phase, a protostar has a much ________ brightness as compared to the Sun
Fill in the blank(s) with correct word
higher
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_________________ galaxies are very luminous at X-ray and ultraviolet wavelengths and have broad emission lines in their spectra
Fill in the blank(s) with correct word
The point where rays intersect when leaving the lens, if they were traveling parallel to the axis when they entered the lens, is called the
A. aperture B. surface normal C. focal point D. vertex
Doubling the mass per unit length of a guitar string will result in changing the wave speed in the string by what factor?
a. 1.41 c. 0.71 b. 1.00 (i.e., no change) d. 2.00
Are the laws of energy [conservation of energy, and 2nd law of thermodynamics] known for certain to be true?
A) No; in fact these laws are known to be violated at sufficiently high speeds, small distances, and large distance. B) No, because all scientific laws are tentative. C) No, for both of the above reasons. D) Yes, because despite repeated checking they have never been found to be false. E) Yes because, unlike some of the other laws, these laws are true by logical deduction from a priori premises.