__________is a possible form of dark energy that can change in strength as the Universe ages
A) Microwave
B) Quintessence
C) Isotope
D) Redshift
B
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Standing Waves on a String: A stretched string is observed to have four equal segments in a standing wave driven at a frequency of 480 Hz. What driving frequency will set up a standing wave with five equal segments?
A. 600 Hz B. 360 Hz C. 240 Hz D. 120 Hz
A newton is larger than a pound
a. True b. False Indicate whether the statement is true or false
The true period of revolution of any planet is
a) the synodic period. b) the sidereal period. c) given in astronomical units. d) always exactly one year.
One of the first tests of the general theory of relativity was the ____
a. description of the orbit of the moon b. determination of the speed of light as a constant c. change in mass of a particle moving at a high speed d. demonstration of a hammer and a feather falling at the same rate on the moon e. determination of the rate of advance of the perihelion of Mercury's orbit