When an alpha particle is emitted from an unstable nucleus, the atomic number of the nucleus
A) decreases by 2.
B) increases by 4.
C) increases by 2.
D) decreases by 4.
E) increases by 6.
C
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Four coins, each with a Head and a Tail, are tossed randomly on to a table. The microstate is defined as the "number of Heads showing". The number of Heads can be, 0, 1, 2, 3, 4. What value for the "number of Heads showing" has the greatest number of microstates?
A. 0 B. 1 C. 2 D. 3 E. 4
What is the inductive reactance of a 2.50-mH coil at 1000 Hz?
A) 2500 ? B) 796 ? C) 15.7 ? D) 2.50 ?
The habitable zone is
a. the region on a planet where conditions are acceptable for life to exist. b. a region around a star where a planet's temperature would permit the existence of liquid water. c. very small for a massive star. d. only found around G and K stars. e. a region on a young planet where amino acids can begin to form DNA molecules.
Scientists have detected mergers of black holes that have spiraled into each other by
A) detecting gravitational waves from the merger. B) observing distant systems that produce unusually strong gamma-ray emission. C) observing distant systems that produce unusually strong radio emission. D) detecting rapidly pulsating sources of gamma-ray emission.