Q. 14.9( 9 Votes )

Fill in the blank

Answer :

(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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