A magnifying glass has a focal length of 7.0 cm. What is the angular magnification if the image is viewed by a person having a relaxed eye with the near point of 25 cm?
A) 1.6
B) 2.6
C) 3.6
D) 4.6
C
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Both RR Lyrae and Cepheid variable stars are stars that, when on the main sequence, were considered to be:
A) low mass. B) intermediate mass. C) high mass. D) zero-age main sequence. E) blue stragglers.
Electrical charges and magnetic poles have many similarities, but one difference is:
a. a magnetic pole cannot be isolated. b. one magnetic pole cannot create magnetic poles in other materials. c. opposite magnetic poles repel. d. magnetic poles do not produce magnetic fields.
What is the "cosmological constant?"
a. The universe has existed forever and on the average (over billions of cubic light years) does not change. b. This is the ratio between "dark energy" and "dark matter.". c. This is a quantity also referred to as "quintessence.". d. This is a self-admitted blunder in his theory of general relativity by Einstein, that might not be a blunder after all.
Observer A sees a pendulum oscillating back and forth in a relativistic rocket and measures its period to be TA. Observer B moves along with the rocket and measures the period of the pendulum to be TB
What is true about these two time measurements? A) TA > TB B) TA = TB C) TA < TB D) TA could be greater or smaller than TB depending on the direction of the motion.