If a radio wave has speed 3.00 × 10^8 m/s and frequency 99.7 MHz, what is its wavelength?
a. 8.78 m
c. 2.78 m
b. 1.50 m
d. 3.01 m
D
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The large planetesimals would have grown faster than the smaller planetesimals because
a. they were moving faster in their orbits than the smaller planetesimals. b. their stronger gravity would pull in more material. c. there was more material located near them that could be accreted. d. the smaller planetesimals were covered by a layer of material that was lost during collisions. e. all of the above
A CD has a diameter of 12.0 cm. If the CD is rotating at a constant frequency of 4.00 cycles per second, then the period of the rotational motion is
A. 0.250 s. B. 0.500 s. C. 0.750 s. D. 1.00 s. E. 1.25 s.
What is your approximate latitude if you observe Polaris to be 35° above the horizon?
A) 35° N B) 35° S C) 55° N D) 55° S E) Polaris cannot be used to find your latitude.
How was Edwin Hubble able to use his discovery of a Cepheid in Andromeda to prove that the "spiral nebulae" were actually entire galaxies?
A) There are no Cepheids in the Milky Way, so his discovery proved that it had to be in another galaxy. B) He measured the stellar parallax of the Cepheid in Andromeda, was able to determine the distance to it, and showed that it was far outside the Milky Way Galaxy. C) From the period-luminosity relation for Cepheids, he was able to determine the distance to Andromeda and show that it was far outside the Milky Way Galaxy. D) Since a Cepheid is a type of luminous galaxy, when he found it in Andromeda he was able to prove that Andromeda was a separate galaxy from the Milky Way.