Thin Lenses: A convex lens has focal length f. If an object is located at "infinity" (very far away), the image formed is located at a distance from the lens
A. of 2f.
B. between f and 2f.
C. of f.
D. between the lens and f.
E. of infinity.
Answer: C
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Heat is ________
a. a measure of the average kinetic energy of molecules in an object b. a property of an object c. the energy transferred between bodies due to a temperature difference d. the specific heat of an object
A blue laser beam is incident on a metallic surface, causing electrons to be ejected from the metal. If the frequency of the laser beam is increased while the intensity of the beam is held fixed,
A) the rate of ejected electrons will increase and their maximum kinetic energy will increase. B) the rate of ejected electrons will remain the same but their maximum kinetic energy will decrease. C) the rate of ejected electrons will remain the same but their maximum kinetic energy will increase. D) the rate of ejected electrons will decrease and their maximum kinetic energy will increase.
When a particle and antiparticle meet, they are said to annihilate each other. What does this mean?
a. They explode into tiny fragments. b. They are destroyed, and turned into an equivalent amount of energy. c. They merge and simply disappear. d. none of the above
Earth has gone in and out of numerous ice ages over the past couple million years. Which of the following was generally true during all those ice ages?
A) The atmospheric carbon dioxide concentration was much higher than it is today. B) The atmospheric carbon dioxide concentration was much lower than it is today. C) The continents were closer together than they are today. D) The continents were farther apart than they are today. E) There were much larger mammals than there are today.