A spaceship moves over my driveway at a relativistic speed. I observe that my driveway is the same length as the ship. I then conclude that the rest length of my driveway is ________ the rest length of the spaceship.
A. greater than
B. less than
C. the same as
Answer: B
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The major observational difference between a Seyfert galaxy and a normal spiral galaxy is that, unlike a normal spiral galaxy, a Seyfert galaxy:
A) usually has shorter spiral arms. B) does not have a black hole at its center. C) has a small, highly luminous nucleus in its bulge. D) does not contain young stars in its spiral arms.
The lakes of Titan consist of liquid ________
Fill in the blank(s) with correct word
The de Broglie wavelength of which of the following objects would be smallest if the objects all had the same momentum?
Diffraction takes place:
a. on highly reflective surfaces. b. on rough surfaces. c. around the edges of barriers. d. for waves moving through empty space. e. in the center of shadows.