Q.4 Fill in the blanks with suitable words.
(a) Time taken by an object to complete one oscillation is called __________.
(b) Loudness is determined by the __________ of vibration.
(c) The unit of frequency is __________
(d) Unwanted sound is called __________ .
(e) The shrillness of a sound is determined by the __________ of vibration.

(a) Time taken by an object to complete one oscillation is called time period.
(b) Loudness is determined by the amplitude of vibration.
(c) The unit of frequency is hertz.
(d) Unwanted sound is called noise.
(e) The shrillness of a sound is determined by the frequency of vibration.

EXPLANATION

The time period is the time taken by a wave to complete one oscillation. It is the reciprocal of frequency.

Amplitude is the maximum displacement or distance moved by a wave measured from its equilibrium position.

Hertz is the unit of frequency which is the measure of 1 cycle in 1 second.

Noise is the unpleasant sound that is loud and disruptive and affects the mental health adversely.

Frequency is the measure of the number of oscillations of a repeating event per unit of time.