The absorption lines in the infrared 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.
c
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Which of the following is an example of convection?
A) warm air expanding and rising, while cooler air contracts and falls B) different kinds of material separating by density, like oil and water C) rocks sinking in water D) gas bubbling upward through a liquid
A lunar eclipse can only happen during a
A) new Moon. B) equinox. C) full Moon. D) perigee. E) aphelion.
A roadway for stunt drivers is designed for racecars moving at a speed of 40 m/s. A curved section of the roadway is a circular arc of 230 m radius
The roadway is banked so that a vehicle can go around the curve with the friction force from the road equal to zero. At what angle is the roadway banked? A) 35° B) 37° C) 33° D) 31° E) 29°
A 0.200-m wire is moved parallel to a 0.500-T magnetic field at a speed of 6.00 m/s. What emf is induced across the ends of the wire?
a. 1.00 V c. 2.25 V b. 0.600 V d. zero