The Arecibo radio telescope is laid out like which optical telescope design?
A) prime focus reflector
B) Newtonian reflector
C) grazing incidence reflector
D) Cassegrain reflector
E) Coude reflector
A
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Ptolemy's model of the universe
a. was heliocentric. b. included elliptical orbits. c. contained epicycles. d. all of the above e. none of the above
The energy of a photon is proportional to the light's
a. wavelength. b. speed. c. frequency. d. intensity. e. two of the above.
A pulley has two supporting strands. To lift a load 1 meter means you will have to pull a distance of
A) 1/2 m. B) 1 m. C) 2 m. D) more than 2 m.
Two point sources emit sound waves of 1.0-m wavelength. The sources, 2.0 m apart, as shown below, emit waves which are in phase with each other at the instant of emission. Where, along the line between the sources, are the waves out of phase with each other by ? radians?
a.
x = 0, 1.0 m, 2.0 m
b.
x = 0.50 m, 1.5 m
c.
x = 0.50 m, 1.0 m, 1.5 m
d.
x = 0.75 m, 1.25 m
e.
x = 0.25 m, 0.75 m, 1.25 m, 1.75 m