Q6 of 46 Page 457

When a rod moves at a relativistic speed v, its mass

if the rod is moving with relativistic speed v, then mass will be given by,



thus, the mass will increase by the factor of


option (A) is correct

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4

Which of the following quantities related to an electron has a finite upper limit?

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A rod of rest length L moves at a relativistic speed. Let L’ = L/γ. Its length

 1

The guru of a yogi lives in a Himalayan cave, 1000 km away from the house of the yogi. The yogi claims that whenever he thinks about his guru, the guru immediately knows about it. Calculate the minimum possible time interval between the yogi thinking about the guru and the guru knowing about it.

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A suitcase kept on a shop’s rack is measured 50 cm × 25 cm × 10 cm by the shop’s owner. A traveler takes this suitcase in a train moving with velocity 0.6c. If the suitcase is placed with its length along the train’s velocity, find the dimensions measured by

(a) the traveler and


(b) a ground observer