Which has a greater luminosity, a star with absolute magnitude +4 or a star with absolute magnitude -6? By how much is it brighter?
What will be an ideal response?
A star with absolute magnitude -6 is intrinsically more luminous than a star with magnitude +4. The difference is 10 magnitudes, so the difference in luminosity is a factor of 100 for the first 5 magnitudes and a factor of 100 for the second 5 magnitudes, making an overall difference of a factor of 1002 = 10,000.
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Energy Levels: Given that the binding energy of the hydrogen atom in its ground state is -13.6 eV, what is the energy when it is in the n = 5 state?
A. 2.72 eV B. -2.72 eV C. 0.544 eV D. -0.544 eV
What makes a star shine?
A. nuclear fusion of light elements B. radioactive decay of elements in its core C. reflected light from the galaxy D. nuclear fission of heavy elements E. None of these choices is correct.
A pendulum clock on the surface of the earth has a period of 1.00 s. On a distant planet, the length of the pendulum must be shortened slightly to have a period of 1.00 s
What is true about the acceleration of gravity on the distant planet? A) The gravitational acceleration of the planet is 0. B) The gravitational acceleration of the planet is slightly greater than g. C) The gravitational acceleration of the planet is slightly less than g. D) There is no gravitational acceleration on the planet. E) The gravitational acceleration of the planet is equal to g.
Determine the magnitude and sense (direction) of the current in the 10-? resistor when I = 1.8 A
a.
1.6 A right to left
b.
1.6 A left to right
c.
1.2 A right to left
d.
1.2 A left to right
e.
1.8 A left to right