The light radiated from the Sun's surface reaches Earth in about 8 minutes, but the energy of that light was released by fusion in the solar core about
A) a hundred years ago.
B) a thousand years ago.
C) tens of thousands of years ago.
D) hundreds of thousands of years ago.
E) a million years ago.
D
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The _______________ time is the amount of time it took light to travel from a celestial object to Earth
Fill in the blank(s) with correct word
The Sun makes most of its energy by the CNO cycle
a. True b. False Indicate whether the statement is true or false
To think of electric potential difference we are thinking about
A) current. B) voltage. C) resistance.
Starting from rest, a car accelerates down a straight road with constant acceleration a for a time t, then the direction of the acceleration is reversed, (i.e., it is ?a), and the car comes to a stop in an additional time t, the time for the whole trip being 2t. At what time, or times, is the average velocity of the car for the trip equal to its instantaneous velocity during the trip?
a. There is no such time. b. It is at the halfway point at t. c. This occurs at 2 times, 0.5t and 1.5t. d. This occurs at 2 times, 0.707t and 1.293t.