What is the speed of a proton if its mass is twice its rest mass?
A)
0.25c
B)
0.50c
C)
0.68c
D)
0.73c
E)
0.87c
E
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In reply to a student's question, a guard in a natural history museum says of the fossils near his station, "When I started work here twenty-four years ago, they were 80 million years old, so you can add it up." Which of the following is the best conclusion that the student can make regarding the age of the fossils?
1.The fossils are less than 80,000,000 years old. 2.The fossils are still about 80,000,000 years old. 3.The fossils are 80,000,024 years old. 4.The fossils are more than 80,000,000 years old.
Each pattern shown below would appear on a screen when monochromatic light first passes through a narrow slit of width a and then strikes a screen. The darkest areas on the page represent the brightest areas on the screen. In which case is the slit illuminated with light of the shortest wavelength?
a.
b.
c.
Presuming that it takes several billion years of complex live to evolve in a stable environment, the stars most likely to currently have inhabited planets are
a. G to K main sequence stars. b. B to A main sequence stars. c. G to K giants. d. white dwarf stars e. neutron stars.
The nights are cold on Mercury because it has a negligible atmosphere
a. True b. False Indicate whether the statement is true or false