wave

It is the right of every person to get best entertainment options because good entertainment options helps in increasing the enjoyment in life. Recently people of Ludhiana also got two great options of enjoying good movies in the form of PVR Ludhiana and Wave Ludhiana.

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Poverty is a condition in which a person or community is deprived of, and or lacks the essentials for a minimum standard of well-being and life. Since poverty is understood in many senses, these essentials may be material resources such as food, safe drinking water, and shelter, or they may be social resources such as access to information, education, health care, social status, political power, or the opportunity to develop meaningful connections with other people in society.

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NATURE OF SOUND WAVES

Sound waves are longitudinal mechanical waves. They can be propagated in solids, liquids, and gases. There a is a large range of frequencies with in which longitudinal mechanical waves cab be generated sound waves being confined to the frequency range which can stimulate the human ear and brain to the sensation of hearing. This range is from 20 cycles/second (20Hz) to 20000 cycles/second (20 KHz), is called the audible range. A longitudinal wage whose frequency is below audible is called infrasonic wave and one above the audible range is called ultrasonic waves. Langevine used an ultrasonic transmitter and receiver made up of quartz during the First World War (1914 -18). Due to small wavelength, noiseless performance and directional property, this wave is preferred over audible sound

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