Question

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) Shrillness of a sound is determined by the ___________ of vibration.

Answer 1

The given problems are related to wave properties of sound waves. To find the correct answer for these problems we will go through the mechanism of the sound wave and the basic definitions of all the wave parameters.

Complete step-by-step answer:
We will go through the basic definitions of wave parameters to find the correct solutions of given problems.

(a) Time period is defined as the time taken by an object to complete one oscillation of its motion. So the correct choice to fill the blank part is Time period.

(b) Amplitude of a wave is defined as the maximum displacement of an object from its mean position. As a sound wave it denotes the loudness level of sound. So the loudness of sound is determined by the amplitude of vibration.

(c) Frequency of a wave is defined as the number of cycles completed by a wave in one second. Frequency is measured in cycles per second or Hertz. So the SI unit of frequency is Hertz.

(d) The unwanted sound that does not have any meaningful sense in observation of sound is called ‘Noise”. So the noise is the correct option to fill the blank.

(e) Shrillness of a sound is determined by the frequency of sound. So frequency is the correct option to fill the blank.

Note: Any wave is characterized by its unique parameters like frequency, amplitude, time-period. Each parameter has an equal importance to generate or modify the waves to move on requirements. So the basic definition of these should be kept in mind.