When the nucleus of an atom emits only a gamma ray, the atom's atomic number
A) decreases.
B) remains unchanged.
C) increases.
Answer: B
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What mass of 14C (having a half-life of 5730 years) do you need to provide a decay rate of 280.0 Bq? (1 u = 1.6605 × 10-27 kg)
A) 1.70 × 10-12 kg B) 5.38 × 10-19 kg C) 3.84 × 10-20 kg D) 8.68 × 10-13 kg
What is one idea why a relatively dense protogalactic cloud more likely to produce an elliptical galaxy than a spiral galaxy?
A) The force of gravity from the higher gas density can pull the material into a more spherical shape. B) The more frequent collisions between particles in the high-density gas randomize the particle orbits. C) The thickness of the dense cloud prevents a disk from forming. D) The higher gas density allows more rapid star formation, leaving little gas to form a disk.
A mechanic working on a 100-m radar tower drops a hammer weighing 44.5 N. The work done on the hammer as it falls is
a. 4.45 N-m. b. 44.5 N-m. c. 445 N-m. d. 4,450 N-m.
The human eye can just detect green light of wavelength 500 nm if it arrives at the retina at the rate of 2 × 10-18 W
How many photons arrive each second? (c = 3.0 × 108 m/s, h = 6.626 × 10-34 J ? s)