The broadening of spectral lines can be caused by:
A) density of the hot medium.
B) thermal motion of the hot atoms.
C) rotation of the star.
D) magnetic fields of the star.
E) All of the above
E
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Motional Emf: A conducting rod whose length is ? = 25 cm is placed on a U-shaped metal wire that is connected to a lightbulb having a resistance of 8.0 ? as shown in the figure. The wire and the rod are in the plane of the page. A constant uniform magnetic field of strength 0.40 T is applied perpendicular to and out of the paper. An external applied force moves the rod to the left with a constant speed of 12 m/s. What are the magnitude and direction of the induced current in the circuit?
A. 150 mA clockwise B. 150 mA counterclockwise C. 34 mA counterclockwise D. 34 mA clockwise E. 100 mA clockwise
What type of star is our Sun?
A) low-mass star B) intermediate-mass star C) high-mass star D) brown dwarf
If I weigh 741 N on Earth at a place where g = 9.80 m/s2 and 5320 N on the surface of another planet, what is the acceleration of objects due to the gravitational attraction on that planet?
A) 70.4 m/s2 B) 51.4 m/s2 C) 61.2 m/s2 D) 81.0 m/s2
Earth's stratosphere is heated primarily by which process?
A) convection from the Earth's surface B) absorption of infrared light by greenhouse gases C) absorption of visible light by ozone D) absorption of ultraviolet light by ozone E) absorption of infrared sunlight