What evidence do we have that large galaxies cannibalize small galaxies?
What will be an ideal response?
Giant elliptical galaxies in rich clusters sometimes have multiple nuclei, thought to be the densest parts of smaller galaxies that have been absorbed and only partly digested.
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By how much is the energy stored in a Hooke's law spring increased when its stretch is increased from 4.00 cm to 8.00 cm?
a. 100% c. 300 % b. 200% d. The correct answer is not given.
A lithium-sodium
A photon cannot create an electron pair unless its frequency is
A) less than 1.24 × 1020 Hz. B) less than 2.47 × 1020 Hz. C) greater than 1.24 × 1020 Hz. D) greater than 2.47 × 1020 Hz. E) infinite.
If an electron acquires more than the ionization energy, the electron will return to the ground state
a. True b. False Indicate whether the statement is true or false