Stars A and B have the same temperature, but star A has twice the radius of star B. What is the ratio of star A’s power output to star B’s output due to electromagnetic radiation? The emissivity of both stars can be assumed to be 1
1.4
2.8
3.16
4.64
1
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A sheet of graphite that is one atom layer thick is called _________.
Fill in the blank(s) with the appropriate word(s).
Tycho Brahe's greatest contribution to astronomy was
a. his model of the universe. b. his telescopic observations. c. his discovery of three laws of motion. d. his 20 years of careful observations of the planets. e. his model of the universe and his telescope observations.
A light ray is incident on the surface of water (n = 1.33) at an angle of 60° relative to the normal to the surface. The angle of the reflected wave is
a. 80° b. 40° c. 20° d. 60° e. 30°
Each of two parallel wires separated by 6.0 mm carries a 40-A current. These two currents are in the same direction. Determine the magnitude of the magnetic field at a point that is 5.0 mm from each of the wires
a. 2.6 mT b. zero c. 1.9 mT d. 1.6 mT e. 3.2 mT