Sound Test - 10

Cochlea, semicircular canals and auditory nerve are associated with inner ear.The internal ear contains colchea.The vibrating bones pass their vibrations to the colchea.The sensitive hair cells present in the colchea respond to the sound vibrations recieved and change them into nerve impulses.These impulses are then carried by the auditory nerves to the brain.

Wave motion is a periodic disturbance in the medium produced by vibrating body. These disturbance moves into medium to produce sounds. Wave motion is also known as propagation of disturbances.

Wave motion is activity that carries energy from one place to another without actually moving any matter.In wave motion, energy—the ability to perform work, or to exert force over distance—is transmitted from one place to another without actually moving any matter along the wave. In some types of waves, such as those on the ocean, it might seem as though matter itself has been displaced; that is, it appears that the water has actually moved from its original position. In fact, this is not the case: molecules of water in an ocean wave move up and down, but they do not actually travel with the wave itself. Only the energy is moved.

Electromagnetic waves differ from mechanical waves in that they do not require a medium to propagate. This means that electromagnetic waves can travel not only through air and solid materials, but also through the vacuum of space.

Wave motion is activity that carries energy from one place to another without actually moving any matter.In wave motion, energy—the ability to perform work, or to exert force over distance—is transmitted from one place to another without actually moving any matter along the wave. In some types of waves, such as those on the ocean, it might seem as though matter itself has been displaced; that is, it appears that the water has actually moved from its original position. In fact, this is not the case: molecules of water in an ocean wave move up and down, but they do not actually travel with the wave itself. Only the energy is moved.

Electromagnetic waves differ from mechanical waves in that they do not require a medium to propagate. This means that electromagnetic waves can travel not only through air and solid materials, but also through the vacuum of space.

In human ear, the sound is amplified in the middle ear by three bone connected with tympanic membrane. The amplified vibration is transmitted to inner ear and is used to produce sensation of hearing.

An object moving at a speed greater than that of sound is moving with supersonic speed and not ultrasonic speed.

Wave motion transfers energy from one point to another, which displace particles of the transmission medium–that is, with little or no associated mass transport. Waves consist, instead, of oscillations or vibrations (of a physical quantity), around almost fixed locations.

Crest is the point of maximum positive displacemnt (elevation) of a transverse wave.

Trough is the point of maximum negative displacement (depression) of a transverse wave .

A compression is that part of a longitudinal wave in which the particles of the medium are closer to one another than they normally are and there is a momentary decrease in the volume of the medium.

A rarefraction is that part of a longitudinal wave in which the particles of the medium are farther apart than that in the normal position and there is a momentary increase in the volume of the medium.

It has been found that the greater the amplitude of the vibration of the source ,the greater is the intensity (and hence,loudness) of sound and vice versa.

Speed greater than the speed of sound is called supersonic speed.

Pitch of a sound depends upon the frequency (or wavelength) of vibration.

Timbre is the characteristic of a musical sound that enables us to distinguish between two sounds of the same pitch and loudness produced by two different sources.It depends upon the waveform of the sound.

Sound waves in air (and any fluid medium) are longitudinal waves because particles of the medium through which the sound is transported vibrate parallel to the direction that the sound wave moves.

Waves that, like sound, vibrate in the same direction as their direction of propagation are longitudinal waves, while waves that vibrate at right angles to their direction of propagation are transverse waves. Radio waves are one kind of transverse wave.

An aeroplane or a supersonic jet moving at supersonic speed produces shock waves in air.These shock waves carry a large amount of energy. 

A mechanical wave is a wave that is an oscillation of matter, and therefore transfers energy through a medium.Any kind of wave (mechanical or electromagnetic) has a certain energy. Mechanical waves can be produced only in media which possess elasticity and inertia.

SI unit of wavelength is metre (m) and velocity is ms^-1.