Most pulsars are observed only as ________ sources
A) X-ray
B) radio
C) gamma-ray burster
D) visible lighthouse
E) ultraviolet repeating
B
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Radioactive Decay: The half-life of cobalt-60 is 5.3 years, while that of strontium-90 is about 29 years. Suppose you have samples of both isotopes, and that they initially contain equal numbers of atoms of these isotopes. How will the activities (number of decays per second) of the samples compare?
A. The activity of the cobalt-60 sample will be greater. B. The activities cannot be compared without more information. C. The activities will be equal. D. The activity of the strontium-90 sample will be greater.
The speed of light in any transparent medium is the same as the speed of light in a vacuum
a. True b. False Indicate whether the statement is true or false
The asteroid belt is between the orbits of
a. Earth and Mars. b. Mars and Jupiter. c. Earth and Venus. d. Jupiter and Saturn.
Which of these is true about the absolute temperature of an ideal gas?
a. It is directly proportional to the average speed of the gas particles. b. It is directly proportional to the average kinetic energy of the gas particles. c. It does not depend on the average kinetic energy of the gas particles. d. It is directly proportional to the volume of the gas particles. e. It is directly proportional to the pressure of the gas particles.