____ has a negative charge and a mass about 1800 times small than a proton
a. A neutron
b. An electron
c. A molecule
d. A nucleus
e. An isotope
B
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A sample of water that is 99.9999 percent pure contains 0.0001 percent impurities. Consider from Chapter 1 that a glass of water contains on the order of a trillion trillion (1 × Image) molecules
If 0.0001 percent of these molecules were the molecules of some impurity, about how many impurity molecules would this be? A) 1000 (one thousand: 1 × Image) B) 1,000,000 (one million: 1 × Image) C) 1,000,000,000 (one billion: 1 × Image) D) 1,000,000,000,000,000,000 (one million trillion: 1 × Image)
What temperature exists inside a solar collector (effective collection area of 15 m2 ) on a bright sunny day when the outside temperature is +20°C?
Assume that the collector is thermally insulated, that the Sun radiates the collector with a power per unit area of 600 W/m2, and that the collector acts as a perfect blackbody. A) 73°C B) 81°C C) 93°C D) 107°C E) 154°C
For a converging lens with two curved surfaces, the radius of curvature for both surfaces is 13.1 cm. If the focal length is 16.5 cm, what must the index of refraction be?
a. 1.40 b. 1.79 c. 1.52 d. 1.56 e. 1.63
A solid conducting sphere (radius = 5.0 cm) has a charge of 0.25 nC distributed uniformly on its surface. If point A is located at the center of the sphere and point B is 15 cm from the center, what is the magnitude of the electric potential difference between these two points?
a. 23 V b. 30 V c. 15 V d. 45 V e. 60 V