The angle between two plane mirrors that meet at one edge is 45°. The change in direction of a ray that strikes the first mirror at a 60° angle of incidence when that ray reflects from the second mirror is
a. 0°
b. 45°.
c. 90°.
d. 150°.
e. 270°.
d
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Suppose the Hubble constant turned out to be 130 km/sec/Mpc and not 65 km/sec/Mpc. How would that affect our estimate of the age of the Universe?
A. The Universe would be about 7 billion yrs old. B. The Universe would be about 30 billion yrs old. C. It would have no effect on our estimates of the Universe's age. D. The Universe would be about 130 billion yrs old. E. None of these choices is correct.
Escape speed for a rocket is less from
A) Earth. B) the Moon. C) the Sun. D) same for each
What is the wavelength of a monochromatic light beam, where the photon energy is 4.14 × 10^?19 J? (h = 6.63 × 10^?34 J?s, c = 3.00 × 10^8 m/s, and 1 nm = 10?9 m)
a. 160 nm b. 480 nm c. 72 nm d. 187 nm e. 915 nm
Overall, what do current data suggest about planetary types in other planetary systems?
A) Planets come in a wider range of types than the planets in our solar system. B) All planets fall into the same terrestrial and jovian categories as the planets in our solar system. C) Jovian planets are common, while terrestrial planets are rare. D) Planets that fall into either the terrestrial or jovian categories are extremely rare outside of our own solar system.