Question

Which of the following examples represent a periodic motion?
(i) A bullet fired from a gun,
(ii) An electron revolving round the nucleus in an atom
(iii) A vehicle moving with a uniform speed on a road
(iv) A comet moving around the Sun, and
(v) Motion of an oscillating mercury column in a U-tube.

Answer 1

Answer:

2,4,5

Explanation:

As periodic motion means repeating of the same path after certain interval of time,in all these three cases the object return to it's path and repeat the motion.