The second postulate of special relativity states that the speed of light, when measured in a vacuum, is constant for all observers
a. True
b. False
Indicate whether the statement is true or false
True
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The velocity of light going from air to glass ______
Fill in the blank(s) with the appropriate word(s).
A small dust particle of mass 7.90 × 10-6 g is being observed under a magnifying lens
Its position is determined to within 0.0050 mm. (1 y = 3.156 × 107, h = 1.055 × 10-34 J ? s) (a) Find the minimum uncertainty in its velocity implied by the uncertainty in its position. (b) Assuming the dust particle is moving at the speed you just found, how many years would it take for the particle to move 1.0 mm?
According to the Big Bang cosmological model, which of the following correctly describes the order of events in the first few minutes of the universe’s existence?
A Carnot engine operates between two reservoirs with unknown temperatures. If the Carnot engine operates at efficiency, what is the ratio of the absolute temperatures of the reservoirs, Tc/Th?
A) 0.33 B) 0.0012 C) 0.0025 D) 0.67