Most of the galaxies in the Local Group are:
A) big spirals like our Galaxy and M31.
B) small spirals like M33 and the LMC.
C) small irregulars like the Magellanic Clouds.
D) active galaxies like Centaurus A.
E) small ellipticals like the companions to M31 in Andromeda.
E
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Tides occur later each day because of
a. Earth's rotation with respect to the Sun. b. the Moon's rotation with respect to Earth. c. Earth's rotation with respect to the Moon. d. a change in gravitational attraction.
A Young's interference experiment is conducted with blue-green argon laser light (l = 515 nm). The separation between the slits is 0.50 mm, and the interference pattern appears on a screen 4.95 m away. What is the spacing between the bright fringes? (1 nm = 10-9 m)
a. 3.4 mm c. 1.7 mm b. 5.1 mm d. 6.8 mm
Quasars have a(n) ____
a. extremely high blueshift b. moderate blueshift c. undetectable Doppler shift d. moderate redshift e. extremely high redshift
Pangaea is believed to have broken up about how many years ago?
a. 2000 million b. 2 million c. 20 million d. 200 million