Which statement best describes white light after it passes through a prism?
A. The white light is a combination of all wavelengths of the visible spectrum.
B. The white light is a combination of the wavelengths of red and blue.
C. The white light has no electromagnetic energy.
D. The white light contains ultraviolet energy.
Answer: A. The white light is a combination of all wavelengths of the visible spectrum.
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A 1.0-m long wire is carrying a certain amount of current. The wire is placed perpendicular to a magnetic field of strength 0.20 T. If the wire experiences a force of 0.60 N, what is the magnitude of the current moving through the wire?
A) 2.0 A B) 1.0 A C) 3.0 A D) 4.0 A E) 5.0 A
A 400-g stainless steel tea kettle containing 500 g of water is on the stove. The portion of the tea kettle that is in contact with the heating element has an area of 0.090 m2 and is 2.0 mm thick
At a certain moment, the temperature of the water is 75°C, and it is rising at the rate of 3.0°C per minute. What is the difference in temperature between the inside and the outside of the bottom of the tea kettle? Assume that the inner surface of the kettle is at the same temperature as the water inside. The thermal conductivity of stainless steel is 16.3 W/m ? K, the specific heat of the steel is 448 J/kg ? K, and the specific heat of water is 4186 J/kg ? K. A) 2.2°C B) 1.5°C C) 1.1°C D) 0.50°C E) 0.15°C
Bones show up in x ray images because they absorb x rays more efficiently than muscle and other tissues do
Indicate whether the statement is true or false
The cosmic microwave background is almost perfectly uniform in all directions, except for very small deviations in its temperature. What do scientists think these small deviations represent?
A) regions of slightly higher density that made it possible for galaxies to form B) small increases in temperature caused by individual stars C) The warmer spots represent regular matter and the cooler spots represent dark matter. D) regions of slightly higher helium abundance in the early universe E) varying redshifts and blueshifts due to motions of gas in the early universe