When a ?- particle is emitted from an unstable nucleus, the atomic mass number of the nucleus
A) increases by 1.
B) decreases by 1.
C) increases by 2.
D) decreases by 2.
E) does not change.
E
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The angular diameters of the Moon and Sun vary slightly because the orbits of the Moon and Earth are slightly elliptical
a. True b. False Indicate whether the statement is true or false
If you see Polaris directly overhead, you must be very close to
A) the equator. B) the South Pole. C) the Tropic of Cancer. D) the North Pole.
Martian volcanoes are larger than volcanoes on Earth because
A) Mars's weaker gravity makes it easier for tall structures to be built up. B) the lack of plate tectonics on Mars means that mantle plumes remain stationary relative to the surface, building up huge, single mountains. C) Mars has more internal heat than the Earth so volcanoes naturally grow to much larger sizes D) Both A and B
An atom containing three outer-shell electrons is added to a Group IV semiconductor such as silicon. The result is
1.a p-type semiconductor. 2.an insulator. 3.an n-type semiconductor. 4.a conductor.