(a) The to and fro motion of a body from its mean position is called One Vibration.
Explanation: Vibration is the disturbance created by some source for example human activity, due to which an object gets displaced forwards and backwards with respect to its initial position. A real life example of it is the vibration of a guitar string.
(b) Number of vibrations per second is called Frequency
Explanation: Frequency is nothing but the number of times an event is repeated in one second.
(c) The intensity of sound can be measured in dB (decibels).
Explanation: Decibels is the unit in which the numeric evaluation of sound is performed.
(d) Sound cannot travel in vacuum.
Explanation: Propagation of sound always requires a material medium and since in vacuum there is no material medium, sound cannot travel in vacuum.
(e) Vibrating bodies produce sound.
Explanation: For the production of sound a vibrating source is a must. For example, while playing guitar, the musical sound is produced due to the vibration of different strings.
(f) The maximum displacement of a body from its mean position is called amplitude.
Explanation: Amplitude is nothing but the farthest distance between an object’s mean position and the displaced position.
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