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

Physics & Space Science

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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

Physics & Space Science

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

Physics & Space Science

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

Physics & Space Science

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.

Physics & Space Science