Exam (elaborations)
Physics Special Theory of Relativity Questions with Solutions
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Physics Special Theory of Relativity
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Physics Special Theory of RelativityWhich of the following statements is correct? - answer Equations of special theory of
relativity are applicable to all speeds.
Which of the following is one of the postulates of the special theory of relativity? -
answer The velocity of light in a vacuum has the same value in all inertial frames of
reference.
An observer measures the length of an object. In which of the following cases is the
measured length at a minimum? - answer The observer and the object move with the
same speed v in the opposite direction.
The period of a simple pendulum is measured to be 4.0 seconds in a frame of
reference. Which of the following is correct when the period of the pendulum is
measured by an observer moving with 0.4 times the speed of the light? - answer The
time period of the pendulum increases.
If an observer is traveling parallel to a rod at twice the speed of the rod, what is does the
observer perceive the length to be? - answerThe length of the rod will decrease.
Which of the following is correct for the inertial frame of reference? - answerA train
moves with constant velocity.
Which of the following is true for the phenomenon of time dilation? - answerA moving
clock runs slower than a stationary clock.
The time taken by the space craft moving at a speed equal to half the velocity of light to
go from star A to star B is 2 years as calculated at the Earth station. Which of the
following is correct for the time measured by the astronaut in the space craft to reach
the star B? - answerless than 2 years
What is meant by absolute time? Why was it not noticed before the development of the
special theory of relativity? - answerAbsolute time means that the time interval Δt
between the events is the same for any observer, whether the observer is at rest or in
motion. The change in time interval is caused by the observer's motion. Since the speed
in our day-to-day life is too low, the change in time interval is difficult to notice. This is
the reason why it was not brought to light before the development of special theory of
relativity.
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