Which of these are effects of the Doppler shift?
A. When an object accelerates, the wavelengths of its light get warmer.
B. When an object is moving toward us, the wavelengths of its light decrease.
C. When an object slows, the wavelengths of its light get cooler.
D. When an object is moving away from us, the frequencies of its light increases.
Answer: B
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Some recent evidence points to the possibility of there being some liquid water on Mars "recently." Why does this puzzle astronomers?
A. Currently Mars is too hot for liquid water. B. The Martian atmosphere is too cold and has too low a pressure for liquid water. C. The Martian atmosphere is too thick, and clouds would form. D. All of these choices are correct.
Why is Europa considered a good candidate for the possible existence of life?
A) Strong evidence suggests that it has a deep, subsurface ocean of liquid water. B) The Galileo spacecraft found strange seasonal changes on its surface that look like they could be due to life. C) It is located within our Sun's habitable zone. D) It has a thick atmosphere with a surface pressure greater than that on Earth.
A circular loop (area = 0.20 m2) turns in a uniform magnetic field with B = 0.13 T. At an instant when the angle between the magnetic field and the normal to the plane of the loop is (?) rads and is decreasing at the rate of 0.50 rad/s, what is the magnitude of the emf induced in the loop?
a. zero b. 13 mV c. 26 mV d. 20 mV e. 18 mV
An uncharged spherical conducting shell surrounds a charge ?q at the center of the shell. Then charge +3q is placed on the outside of the shell. When static equilibrium is reached, the charges on the inner and outer surfaces of the shell are respectively
a. +q, ?q. b. ?q, +q. c. +q, +2q. d. +2q, +q. e. +3q, 0.