The absorption lines in the visible portion of the spectrum of a star that are produced by hydrogen are from the
a. Lyman series.
b. Balmer series.
c. Paschen series.
d. isotopes of hydrogen.
e. ions of hydrogen.
B
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Two objects undergo a collision, and there is no external force on the objects. This means that:
A. Both objects move at constant velocity B. The objects have equal and opposite velocities C. The center of mass moves with constant velocity D. The center of mass is stationary
Venus's surface temperature is fairly uniform from the equator to the poles because
a. Venus rotates very rapidly, which causes strong zonal winds. b. Venus is covered by a thick cloud layer that absorbs most of the sunlight that falls on it. c. the carbon dioxide in Venus's atmosphere efficiently emits infrared radiation. d. Venus rotates slowly so Coriolis forces do not disrupt Hadley circulation. e. Venus's orbit is nearly perfectly circular.
Jupiter puts back into space twice the energy it gets from the Sun
Indicate whether the statement is true or false
What is the radius of curvature of the path of a 3.0-keV proton in a perpendicular magnetic field of magnitude 0.80 T?
a. 9.9 mm b. 1.1 cm c. 1.3 cm d. 1.4 cm e. 7.6 mm