NCERT Question 4 - Chapter 13 Class 8 - Sound

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.