The luminosity class is assigned to a star by studying the absorption lines in the spectrum of the star
a. True
b. False
Indicate whether the statement is true or false
True
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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 few hundred thousand years ago B) one hundred years ago C) three days ago D) one thousand years ago
Of the various wavelengths emitted from a hydrogen gas discharge tube, those associated with transitions from higher levels down to the n = 2 level produce which of the following?
a. visible c. ultraviolet b. infrared d. a mixture of visible and ultraviolet
The magnetic forces exerted on each other by two parallel wires with unequal currents flowing in opposite directions is
A. repulsive and unequal in magnitude. B. attractive and unequal in magnitude. C. repulsive and equal in magnitude. D. attractive and equal in magnitude.
Charge Q is uniformly distributed over a line segment of length 2L, as shown below. When the x-coordinate of point P is x, the magnitude of the y-component of the electric field at point P is
A.
B.
.C.
.D.
.E.
.