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

Physics & Space Science

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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

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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

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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?

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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

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