As more and more mass falls into a black hole, the radius of its photon sphere
A. decreases.
B. increases.
C. remains unaffected.
Answer: A
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The Earth pulls on the Moon. Similarly, the Moon pulls on the Earth, evidence that
A) Earth and the Moon are simply pulling on each other. B) Earth's and the Moon's pulls comprise an action—reaction pair. C) both A and B
Which of the following forests are made up of cone-bearing trees?
A) evergreen B) deciduous C) tropical rain forest D) polar E) tropical savanna
A wave-built platform is one in which sediment eroded from sea cliffs is transported seaward until it is
deposited at the edge of the wave-built platform. Indicate whether the statement is true or false.
Ammonia , NH3, is a stronger base than the acetate ion, CH3COO-. When acetic acid, CH3COOH, reacts with ammonia, NH3, what species are present in the solution in the largest amount?
A) acetic acid, CH3COOH, and ammonia, NH3 B) acetic acid, CH3COOH, and ammonium, NH4+ C) acetate ion, CH3COO-, and ammonia, NH3 D) acetate ion, CH3COO-, and ammonium ion, NH4+