Energy in Capacitors: Doubling the capacitance of a capacitor that is holding a constant charge causes the energy stored in that capacitor to
A. quadruple.
B. double.
C. decrease to one-half.
D. decrease to one-fourth.
Answer: C
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Which of the following sequences of electromagnetic radiation is arranged in the order of increasing energy?
A) Gamma rays, X-rays, infrared radiation, and radio waves B) Radio waves, microwaves, gamma rays, and ultraviolet radiation C) Visible light, ultraviolet radiation, X-rays, and gamma rays D) Visible light, microwaves, radio waves, and infrared radiation
A girl is sitting on the edge of a pier with her legs dangling over the water. Her soles are 80.0 cm above the surface of the water. A boy in the water looks up at her feet and wants to touch them with a reed. (nwater = 1.333.) He will see her soles as being
a. right at the water surface. b. 53.3 cm above the water surface. c. exactly 80.0 cm above the water surface. d. 107 cm above the water surface. e. an infinite distance above the water surface.
A temperature difference of 5 K is equal to
a. a difference of 9 on the Celsius scale. b. a difference of 9 on the Fahrenheit scale. c. a difference of 2.8 on the Rankine scale. d. a difference of .5 on the Fahrenheit scale. e. a difference of 2.8 on the Celsius scale.
Venus has a significant magnetic field
a. True b. False Indicate whether the statement is true or false