Sound Test - 6

The speed of sound is faster in solid medium in comparison to liquid and gaseous medium. Aluminium is solid and metal, so the speed of sound will be maximum in it. Speed of sound in Aluminium at 25 degree celcius is 6420 ms^-1

Hertz (Hz) is SI unit of frequency. Frequency is the number of vibration per second.

A wave can be described as a disturbance that travels through a medium from one location to another location. 

Mechanical Waves are waves which propagate through a material medium (solid, liquid, or gas) at a wave speed which depends on the elastic and inertial properties of that medium.

A transverse wave is a moving wave that consists of oscillations occurring perpendicular (right angled) to the direction of energy transfer (or the propagation of the wave). If a transverse wave is moving in the positive x-direction, its oscillations are in up and down directions that lie in the y–z plane.

Oscillatory motion can be termed as the repeated motion in which an object repeats the same movement over and over,i.e., to and fro or back and forth motion.

A longitudinal wave is a wave in which particles of the medium move in a direction parallel to the direction that the wave moves.Longitudinal wave needs a material medium to travel ,i.e, solids,liquids and gases.

Light and Radio waves are electromagnetic waves that does not require any medium of propagation.

Speed of sound is different at different temperature. With increase in temperature, speed of sound increases.

The loudness of sound is measured in units called decibels (dB). A decibel unit expresses the relative intensity of sounds on a scale from zero for the average least perceptible sound to about 100 dB, which is near the level most people find uncomfortably loud.

Frequency of infrasonic waves is less than the frequency of ultrasound waves.
Frequency of infrasonic waves are less than 20Hz whereas frequency of ultrasonic waves are greater than 20,000Hz.

The sound whose frequency lies between 20 Hz and 20000 Hz which human beings are able to hear is called audible sound. So,the audible range of human ear is 20-20000 Hz.

Wavelength is the distance between two consecutive crest or trough in case of transverse wave. Here, distance between the consecutive crest and trough is x, so, wavelength will be 2x.