Which of the following correctly describes the meaning of albedo?
A) The lower the albedo, the more light the surface reflects, and the less it absorbs.
B) The higher the albedo, the more light the surface reflects, and the less it absorbs.
C) The higher the albedo, the more light the surface absorbs.
D) The higher the albedo, the more light the surface emits.
E) The higher the albedo, the more light the atmosphere absorbs.
B
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Which of the following statements is true regarding the stars in a stellar association?
A) They orbit a common center of mass. B) They were not formed together. C) They are gravitationally bound to one another. D) They drift away from each other in a few million years.
One light-year is approximately
A) the distance from the Sun to Earth. B) the speed at which Earth orbits the Sun. C) 10 trillion kilometers. D) the same as one regular year.
A straight 10-cm wire bent at its midpoint so as to form an angle of 90° carries a current of 10 A. It lies in the xy plane in a region where the magnetic field is in the positive z direction and has a constant magnitude of 3.0 mT. What is the magnitude of the magnetic force on this wire?
a. 3.2 mN b. 2.1 mN c. 5.3 mN d. 4.2 mN e. 6.0 mN
An electromagnetic wave is propagating towards the west in free space. At a certain moment the direction of the magnetic field vector associated with this wave points vertically upward. What is the direction of the electric field vector?
A) horizontal and pointing south B) vertical and pointing down C) horizontal and pointing north D) vertical and pointing upward E) horizontal and pointing east