A solar eclipse occurs at or near the time of a
a. first-quarter moon.
b. last-quarter moon.
c. new moon.
d. full moon.
c
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An expanding shell of gas ejected from a medium-mass star during the latter stages of its evolution is known as a black hole
Indicate whether the statement is true or false
In optical fibers of uniform density, light actually
A) curves in a direction parallel to the central axis of the fiber. B) travels in straight-line segments. C) travels along the outer surface of the fiber. D) none of the above
A 5-kg piece of lead (specific heat 0.03 cal/g/°C) having a temperature of 80°C is added to 500 g of water having a temperature of 20°C. What is the final equilibrium temperature (in °C) of the system?
a. 79 b. 26 c. 54 d. 34 e. 20
When an unstable nucleus decays by emitting an alpha particle, the atomic mass number of the nucleus
A) increases by 4. B) increases by 2. C) decreases by 2. D) decreases by 4. E) remains unchanged.