The time interval during which a nucleus has a 50% probability of decaying is its
a. half-life.
b. decay time.
c. nuclei activation time.
d. binding energy time.
e. none of the above.
a
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A long solenoid (radius = 3.0 cm, 2 500 turns per meter) carries a current given by I = 0.30 sin(200pt) A, where t is measured in s. When t = 5.0 ms, what is the magnitude of the induced electric field at a point which is 2.0 cm from the axis of the solenoid?
a. 7.3 × 10^-3 V/m b. 6.4 × 10^-3 V/m c. 6.9 × 10^-3 V/m d. 5.9 × 10^-3 V/m e. 8.9 × 10^-3 V/m
When do we say that a star is born?
A. when the interstellar cloud collapses B. when the interstellar matter achieves the Jeans instability C. when the star leaves the main sequence D. when fusion of hydrogen atoms into helium atoms starts
H II Regions are also called emission nebulae
a. True b. False Indicate whether the statement is true or false
Jovian planets are thought to form beyond the frost line of their star systems. How, then, might it be possible for a large moon around a jovian planet to have a habitable surface with liquid water?
A) The moon would need to be locked in synchronous rotation with its planet. B) The jovian planet would need to have migrated inward to the habitable zone of its star. C) The moon would need to have a magnetic field. D) The moon would need to have plate tectonics. E) The moon would need to have a high density.