Sound

                                                                      Sound

What is sound?

In physics, sound is a vibration that propagates as an acoustic wave, through a transmission medium such as a gas, liquid or solid. In human physiology and psychology, sound is the reception of such waves and their perception by the brain. Sound is created when something vibrates and sends waves of energy (vibration) into our ears. The vibrations travel through the air or another medium (solid, liquid or gas) to the ear. The stronger the vibrations, the louder the sound.

Sound waves are characterized into three types. Audible sound waves are those that humans can hear. Infrasonic waves are those that are too low-frequency (below 20 Hz) for humans to hear. Ultrasonic sounds waves are those that are too high-frequency (above 20,000 Hz) for humans to hear.
Since sound is a wave, it has all of the properties attributed to any wave, and these attributes are the four elements that define any and all sounds. They are the frequency, amplitude, wave form and duration, or in musical terms, pitch, dynamic, timbre (tone colour), and duration.
It is produced from a vibrating body. The vibrating body causes the medium (water, air, etc.) around it to vibrate thus producing sound. The sound is produced when something vibrates 
Sound measurements are done by determining the amplitude of the spectral components or by detecting the sound pressure through a physical device, e.g. a microphone. The total sound level of a signal is a root-sums-of-squares of the amplitude of all the spectral components.





Comments

Post a Comment

Popular posts from this blog

Solar System

Image
                                                                  Science sun The Sun  is the only star in our solar system. It is the centre of our solar system, and its gravity holds the solar system together. its   Temperature: 5,973°C to 15,000,000°C.               mercury At a distance of only about 1/3 of Earth's distance to Sun, Mercury is the first planet in our Solar System . With a diameter of only 4880 kilometres (3032 miles) Mercury is the smallest planet in the Solar System. It is barely bigger than our Moon. Not only is Mercury the smallest planet, it is also shrinking! Venus Venus is the second closest planet to The Sun. It is the hottest planet in the Solar System. There are yellow clouds on Venus. Venus is the only planet in our Solar System that r...
Read more

Forces

Image
                                                                    Forces What is a force? A force is The push or pull on an object with mass causes it to change its velocity . Force is an external agent capable of changing a body's state of rest or motions It has a magnitude and a directions. They are measured in Newtons.     types of force .. . Gravitational force.-    a force of attraction (attractive force) that attracts all physical forms having mass Non-contact forces- they pull or push on objects without touching them Magnetic force.-  attraction or repulsion that arises between electrically charged particles because of their motion Nuclear force.-  a force that acts between the protons and neutrons of atoms . Frictional force.-  t he force that resists motion when the surface ...
Read more

State Of Matter

Image
                                                       State Of Matter What is the 3 state of matter? There are three states of matter: solid; liquid and gas. They have different properties, which can be explained by looking at the arrangement of their particles. Solids ... Solids have a fixed shape and fixed volume, which means they don't move to fill a container when they're placed in it. They hold their own shape and volume. Solids cannot be compressed into a smaller space very easily. There's not much space between the  atoms. Most solids change their shape if they are squeezed or pulled with enough force . The particles in the solid cannot move closer together, but they can often slide around and past each other if they are pushed hard enough. Thin bars and sheets of solids can often be bent or moulded. Liquids ... The atoms in ...
Read more