A__________is a small nebula that varies irregularly in brightness, evidently associated with star formation
A) Herbig-Haro object
B) brown dwarf
C) Bok globule
D) T Tauri star
A
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Two thin layers of material with different indices of refraction are coated on a glass plate. The outer first material has n1 = 1.461, the inner second material has n2 = 1.544, and the glass has nglass = 1.62 . If light is incident from air on the first layer, what is the phase change for light that reflects from the glass?
a. 180° b. 0° c. 360° d. 540° e. 720°
The use of thermal mass on a direct gain passive solar system _______
a. reduces temperature fluctuations during the day. b. provides foundation support for the collector superstructure c. increases the insolation on the south-facing windows d. increases temperature fluctuations during the night
The waves of an earthquake are detected by an instrument called a
a. seismometer. b. seismogram. c. seismograph. d. seismoscope.
The magnetic field and the number of turns of a coil of wire are doubled, while its area is reduced by a factor of 2. Assuming that all the other parameters remain the same, what happens to the induced emf in that coil of wire?
A) It is doubled. B) It is reduced by a factor of 2. C) It is quadrupled. D) It is reduced by a factor of 4. E) It stays the same.