Which of the following examples represent periodic motion?
(a) A swimmer completing one (return) trip from one bank of a river to the other and back.
(b) A freely suspended bar magnet displaced from its N-S direction and released.
(c) A hydrogen molecule rotating about its center of mass.
(d) An arrow released from a bow. 11th physics , chapter-14
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(a) There is no repetition of the motion as the swimmer just completed one trip : hence it isn't periodic .
(b) The motion is repeated after a certain interval of time , hence periodic.
(c) Rotatary motion is periodic as repeating after fixed time - interval .
(d) There is no reputation , hence it isn't periodic .
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