The vertical axis (Y-axis) of the Hertzsprung-Russell Diagram is labeled with _______________
Fill in the blank(s) with correct word
luminosity
absolute magnitude
MV
brightness
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The escape velocity inside a black hole is
A. half the speed of light. B. infinity. C. greater than the speed of light. D. zero. E. unknown.
In quantum mechanics, what is the path of the particle across the box?
a. The shortest possible distance, i.e., a straight line. b. Along the curve of the standing wave amplitude. c. Reflecting at random angles off the sides of the box. d. Reflecting off the sides of the box with the angle of incidence equal to the angle of reflection. e. The question cannot be answered.
A certain utility transformer is designed to step up the emf from 1 kV to 25 kV. If the primary has 1000 turns of wire, how many turns of wire does the secondary have?
A. 25,000 B. 4000 C. 2500 D. 40 E. 25 F. Some other result (specify). T. One needs more information to answer.
Since atoms are mostly empty space, why don't objects pass through one another?
A) The electrons on the atoms repel other electrons on other atoms when they get close. B) The nucleus of one atom repels the nucleus of another atom when it gets close. C) The nucleus of one atom attracts the nucleus of a neighboring atom to form a barrier. D) The electrons of one attract the nucleus of a neighboring atom to form a barrier.