Define the following terms. Also, write their SI units.

(a) amplitude

(b) time period

(c) frequency


a) The maximum displacement of a vibrating body on either side of its central/mean position is called amplitude. Its SI unit is metre.

b) The time taken by a vibrating body to complete one vibration. (or time taken for one complete cycle of vibration about a given mean point.) The SI unit of time period is second.

c) the number of cycles of vibrations in one second is called frequency. The SI unit of frequency is hertz (Hz).