The radiation emitted from a star has a maximum intensity at a wavelength of 300 nm. What is the temperature of this star?
a. 300 K
b. 100 K
c. 900,000,000 K
d. 90,000 K
e. 10,000 K
e
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What do astronomers mean by a constellation?
A) A constellation is a region in the sky as seen from Earth. B) A constellation is a group of stars related through an ancient story. C) A constellation is any random grouping of stars in the sky. D) A constellation is a group of stars that are all located in about the same place in space.
The best answer to both the flatness and horizon problems is
A) the Steady State Theory. B) the GUT theory. C) the inflationary epoch. D) dark energy. E) decoupling.
A particle (m = 3.0 ?g, q = 5.0 ?C) moves in a uniform magnetic field given by (
) mT. At t = 0 the velocity of the particle is equal to (
) m/s. The subsequent path of the particle is
A. circular with a 50-cm radius. B. helical with a 6.3-cm pitch. C. circular with a period of 31 ms. D. helical with a 40-cm radius. E. none of the above
Three capacitors of 0.60, 1.2, and 2.9 ?F are connected in series. Find the combined capacitance
a. 2.8 ?F b. 4.7 ?F c. 6.8 ?F d. 0.35 ?F e. 2.1 ?F