Per unit area (such as a square centimeter), a B star whose surface temperature is 10,000 K will put out how much radiation compared to an O star whose surface temperature is 30,000 K?
A) 81 times as much
B) 9 times as much
C) 1/81 as much
D) 1/9 as much
E) 1/3 as much
C
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Solenoid: When you double the number of windings in an ideal solenoid while keeping all other parameters (radius, length and current) fixed, the magnetic field at the center of the solenoid will
A. double. B. triple. C. quadruple. D. be reduced by a factor of one-half. E. be reduced by a factor of one-fourth.
The strong nuclear force is the force that holds the protons and neutrons in the nucleus together
Based on the fact that atomic nuclei can be stable, briefly explain how you can conclude that the strong force must be even stronger than the electromagnetic force, at least over very short distances.
9/5 of a Fahrenheit degree is equivalent to
A) 273.16 K. B) 1°C. C) 1 K°. D) 1 C°. E) 373.16 K.
Light waves travel fastest in
a. water. b. glass. c. a vacuum. d. air. e. none of these; they travel at the same speed in all these media.