Q2 of 46 Page 457

As the speed of a particle increases, its rest mass

As the mass is at rest, its value is not changed when observed with the frame moving with the velocity v.


Thus, correct option is C.

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A person travelling in a fast spaceship measures the distance between the earth and the moon. Is it the same, smaller or larger than the value quoted in this book?

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The magnitude of linear momentum of a particle moving at a relativistic speed v is proportional to

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An experimenter measures the length of a rod. Initially the experimenter and the rod are at rest with respect to the lab. Consider the following statements.

(A) If the rod starts moving parallel to its length but the observer stays at rest, the measured length will be reduced.


(B) If the rod stays at rest but the observer starts moving parallel to the measured length of the rod, the length will be reduced.


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An experimenter measures the length of a rod. In the cases listed, all motions are with respect to the lab and parallel to the length of the rod. In which of the cases the measured length will be minimum?