Answer the following questions in brief. a)Explain how sound produced by a vibrating object reaches our ears through air. b) State one difference between audible and inaudible sound. c) State the structure and function of the pinna of human ear.
Answers
Answer:
A) Region of high pressure and high density is called compression and region of low pressure and low density in the air is called rarefaction. As the object continues to vibrate, it produces a series of successive compression and rarefaction in the air, thus, propagating sound through the air and finally reaches our ears.
B). Audible sounds are sounds of frequency which are audible to human ear. However, on the other hand, inaudible sounds are those sounds who have frequency not audible for human ear. The frequency of audible sounds is usually 20-20,000 hertz, while that of inaudible is above 20kHz(kiloHertz).
C). The pinna of the outer ear protects the eardrum from intense sound and channels the sound to the eardrum through the auditory canal. The eardrum vibrates and transmits the sound to the inner ear. The ossicles of the middle ear amplify the sound and pass the vibration to the oval window.