State Lenz's Law
What will be an ideal response?
An induced current flows in the direction that opposes the change that caused the current.
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A star is observed with a surface temperature of 3,000 K and a luminosity of 10?2 solar. What is the approximate mass of this star?
A) 0.5 Msun B) 0.9 Msun C) 0.2 Msun D) The mass cannot be determined.
Suppose Bohr had chosen the potential energy of the electron in the hydrogen atom to be V = 0 when the electron is in the orbit with n = 1 . He could do this by
a. choosing n = 1 for the orbit where the kinetic energy of the electron is zero. b. adding a constant 13.6 eV to the potential energy for all values of n. c. adding a constant 27.2 eV to the potential energy for all values of n. d. subtracting a constant 13.6 eV from the potential energy for all values of n. e. subtracting a constant 27.2 eV from the potential energy for all values of n.
What does the technique of interferometry allow?
A) It allows two or more telescopes to obtain a total light-collecting area much larger than the total light-collecting area of the individual telescopes. B) It allows two or more telescopes to obtain the angular resolution of a single telescope much larger than any of the individual telescopes. C) It allows us to determine the chemical composition of stars. D) It allows astronomers to make astronomical observations without interference from light pollution. E) It allows the same telescope to make images with both radio waves and visible light.
One of the effects of Mercury's very slow spin is
A) tectonic activity. B) large variations in the size of its polar cap. C) an intensely powerful magnetic field. D) wind patterns that are slow, but global in size. E) extreme variations in its surface temperature.