Sound Test - 2...

Before playing the orchestra in a musical concert, a sitarist tries to adjust the tension and pluck the strings suitably. By doing so, he is adjusting the

Fill in the blanks:

The outer ear, called ______, receives sound from the surroundings. This sound passes to the ________ through the auditory canal. At the end of the auditory canal, there is a thin membrane called ______ or tympanic membrane. The eardrum is forced to vibrate due to pressure variations in the air. A set of bones in the middle ear amplifies these vibrations of the eardrum and forwards these to the inner ear. Then, these vibrations are converted into electrical signals by _______.

Eardrum vibrations are amplified several times by three bones in the middle ear. These bones are

An ear converts pressure variations in the air with audible frequencies into electrical signals and these signals travel to the brain through the ___________.

An echo returns in 0.3 s. What is the distance of the reflecting surface from the source of sound?
(Speed of sound = 344 ms^-1)

Two sound waves travelling in the same medium have time periods in the ratio 3 : 5. The ratio of their speeds is