Centre of Mass 4 Question 2

3. A pulse of light of duration 100ns is absorbed completely by a small object initially at rest. Power of the pulse is 30mV and the speed of light is 3×108ms1. The final momentum of the object is

(a) 0.3×1017kgms1

(b) 1.0×1017kgms1

(c) 3.0×1017kgms1

(d) 9.0×1017kgms1

(2013 Adv.)

Objective Questions II (One or more correct option)

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Answer:

Correct Answer: 3. (b)

Solution:

  1. Final momentum of object = Power × time  Speed of light 

=30×103×100×1093×108=1.0×1017kgm/s



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