In order to produce a sustained interference pattern by light waves from multiple sources, which of the following conditions must be met?
a. Sources are monochromatic. c. Both choices a and b are valid. b. Sources are coherent.
d. None of these are valid.
C
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Which of the following explains why the stars of Orion's belt rise in the east and set in the west?
A) Earth rotates once each day. B) Earth orbits the Sun once each year. C) The direction of Earth's axis in space precesses with a period of about 26,000 years. D) Stars appear to move randomly relative to our Sun in the local solar neighborhood. E) The universe is expanding.
The object described in problem N12T.2 has an orbital eccentricity of:
A. 1.08 B. 1.81 C. 0.81 D. 0.90 E. 1.35 F. Other (specify)
A convex mirror has
A) no focal length. B) a positive or negative focal length depending on the object position. C) a positive focal length. D) a negative focal length. E) a positive or negative focal length depending on the object size.
A 0.28-kg stone you throw rises 34.3 m in the air. The impulse your hand receives from the stone while it throws the stone is
a. 2.7 N s, up. b. 2.7 N s, down. c. 7.3 N s, up. d. 7.3 N s, down. e. 9.6 N s, up.