When spiral galaxies do collide, the impact is greatest on their:
A) individual stars.
B) galactic nuclei.
C) giant molecular clouds.
D) open clusters.
E) globular clusters.
C
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Geologists have principally used which class of rocks to establish the relative time scale?
a. Igneous b. Foliated c. Metamorphic d. Sedimentary
What did astronomers use in the anticoded message sent to globular cluster M13?
a. dashes and dots b. numbers and letters c. pulses and gaps d. hieroglyphics e. holograms
An object 2.0 cm tall is placed 24. cm in front of a convex mirror whose focal length is 30. cm
(a) Where is the image formed? (b) How tall is it?
What is the minimum x-ray wavelength produced when electrons are accelerated through a potential of 46,800 V? (h = 6.63 × 10^?34 J?s, c = 3.00 × 10^8 m/s, and 1 eV = 1.60 × 10^?19 J)
a. 4.25E–11 m b. 8.85E–12 m c. 4.01E–12 m d. 2.66E–11 m e. 6.80E–11 m