The sound from a mosquito is produced when it vibrates its wings at an average rate of 500 vibrations per second. What is the time period of the vibration?

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.

A pendulum oscillates 40 times in 4 seconds. Find its time period and frequency.

Identify the part which vibrates to produce sound in the following instruments.

(a) Dholak (b) Sitar (c) Flute

What is the difference between noise and music? Can music become noise sometimes?