The half-life of a muon is 2.2 ?s. How fast is it moving relative to an observer who says its half-life is 4.4 ?s?
a. 0.87c
b. 0.75c
c. 0.97c
d. 0.72c
e. 0.50c
a
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Which of the following types of electromagnetic radiation has the greatest energy?
a. X-rays b. visible light c. radio d. gamma rays e. infrared radiation
What part of the eye creates the most refraction as light passes through it?
A. Cornea B. Aqueous humor C. Iris D. Lens
What do "forbidden" lines reveal about interstellar space?
A) The density or pressure of this gas is much lower than can be produced in a laboratory. B) The laws of physics are not the same in space as they are on Earth. C) There are unknown elements in space that do not correspond to elements found on Earth. D) There are molecules found in meteorites and interstellar dust that are not found on Earth. E) All of the above are true.
Suppose you receive a message from a starbase that is 13.0 light-years from earth. The message is dated July 15, 2127. What year does your calendar indicate at the time of reception if your calendar and the station’s calendar are correctly synchronized?
A. 2127 B. 2114 C. 2140 D. Other (specify)