The eardrum is located inside the ears. When the sound waves fall on the eardrum, the eardrum starts vibrating back and forth and eardrum pass this vibration to another part of the ear. The eardrum is a thin membrane that divides your middle ear from your ear canal (the part that is exposed to the outside).

The hertz is the unit of frequency which is equal to the number of cycles per second. It is denoted by symbol Hz . It is named after Heinrich Rudolf Hertz, the first person to provide conclusive proof of the existence of electromagnetic waves.

Sound is produced in the human beings in the voice box which is called 'larynx'. It is situated in our throat at the top of the wind-pipe (or trachea). The human voice box contains two ligaments known as vocal cords, this vibrates to produce sound.

Any unpleasant or loud sounds around us are called noise. Noise is produced by the irregular vibrations of the sound producing source.

The repetitive to and fro motion of an object about its mean position at regular time intervals are known as oscillation. Oscillation refers to any periodic motion which moves across the equilibrium position at a distance and repeats itself over and over for a particular period.

Label the different parts of the human ear and answer the following question. What is the function of the eardrum?

The eardrum is a thin, elastic and circular membrane that is stretched tightly is present at the end of the ear canal. The sound waves pass through the ear canal and fall on the eardrum. When these waves fall on the eardrum, the eardrum starts vibrating back and forth rapidly and pass the vibrations inside to other parts of the ear.