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difference btw transverse and longitudinal waves.

   A wave in which the particles of the medium vibrate up and down 'at right angles' to the direction in which the wave is moving, is called a transverse wave.

Examples:

1. The ripples formed on the surface of water in a pond.
2. The vibrations of stretched wires.

 A wave in which the particles of the medium vibrate back and forth along the same direction in which the wave is moving, is called a longitudinal wave.

Examples:

1. The sound waves in air.
2. The waves produced in air when a sitar wire is plucked.