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Modern Physics. Special Relativity Questions Graded A+
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Modern Physics. Special Relativity
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Modern Physics. Special RelativityDescribe Galilean time - answermeasured by a universal clock who's reading is
instantaneously available at all grid points in the f.o.r
Define a reference frame - answeran array of rigid, massless, impenetrable, infinite rods
defining a grid of points over space (with synchronised clocks at the grid points)
How do we know that there is no universal time? - answerc is constant (i.e. if d
changes, t must change)
Define proper time - answerthe time interval between two events with the same spacial
coordinates
Define inertial reference frame - answera frame of reference where an isolated particle
moves at constant velocity (or a f.o.r which is sufficiently far from physical influence that
their effects can be neglected)
What was the key result of the Michelson-Morley experiment? - answerno shift in the
fringes
What does the Michelson-Morley experiment show? - answerno ether, light can
propagate in a true vacuum and the observed speed of light is constant (no matter
speed of Earth)
Define special relativity postulate 1 - answerThe laws of physics are the same in all
inertial frames of reference
Define special relativity postulate 2 - answerc is the same in a vacuum is constant in all
inertial frames
Define proper length - answerthe length measured in the frame of reference in which
the object is at rest
How are clocks synchronised? - answeran observer generates a flash of light from
centre of two clocks, photons start each clock
Moving clocks... - answerrun slow
Leading clock... - answerlags (for synchronised clocks in a moving frame)
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