What is the least value for an index of refraction?
A. 0
B. 0.5
C. 1
D. just less than 1
E. (1/2)1/2
C. 1
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The second postulate of special relativity states that ____
a. observers cannot detect their uniform motion except relative to other objects b. observers cannot distinguish locally between inertial forces and uniform gravitational forces due to acceleration and the presence of a massive body c. the laws of physics are the same for all observers regardless of their motion as long as their speed is constant d. the speed of light is constant and will be the same for all observers independent of their motion relative to the light source e. the acceleration of an object is proportional to the applied force and inversely proportional to its mass
Consider a scale on which our entire Milky Way Galaxy is about the size (diameter) of a grapefruit. Which of the following best describes the size and distance of the Andromeda Galaxy on the same scale?
A) a grapefruit about 3 meters away B) a grapefruit about 3 centimeters away C) a beach ball about the length of a football field away D) a peanut about 3 centimeters away E) a grapefruit about 3 kilometers away
What is the focal length of a magnifying glass that produces an angular magnification of 7.0 x when used by a person with a near point at 28 cm?
A) 2.0 cm B) 3.0 cm C) 4.0 cm D) 5.0 cm E) 6.0 cm
Hawking radiation