Concept and nature of sound.Wave length and frequency, infrasonic and Ultrasonic sounds, Sources of Infrasonic sound In nature, Ultrasonic sound characteristics and some applications.

Sound is a longitudinal wave, in which the particles oscillate to and fro in the same direction of wave propagation. Sound

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Solar system, relative position of Earth with respect to Sun and other planets, movement of earth and moon in solar system, lunar and solar eclipses

The solar system consists of the Sun and its eight main planets, their satellites, asteroids, comets, meteors and other dwarf

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Definition of speed,velocity, gravity, mass, weight, force, impact, work, power and energy

Speed An object is said to be in motion if it changes its position with time, with respect to its

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System of Units: MKS, CGS and SI

Measurement of any physical quantity involves comparison with a certain basic, arbitrarily chosen, internationally accepted reference standard called unit. The

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