The Learning Track

Pascal:

"A unit of pressure

Paschen series:

A group of lines in the infrared region in the spectrum of hydrogen.

Pauli Exclusion Principle:

"No two electrons in an atom can have the same four quantum numbers; thus

Peltier effect:

The evolution or absorption of heat at the junction of two dissimilar metals carrying current.

Period of oscillation:

The time required for one complete oscillation.

Periodic motion:

The motion which repeats itself after regular intervals of time.

Photoelectric effect:

The emission of electrons in some materials when light of suitable frequency falls on them.

Photons:

A quanta of energy in light wave; the particle associated with light.

Planck's constant:

"The ratio of energy to frequency

Plasma:

A highly ionized gas composed entirely of equal number of positive ions and electrons.

Plasticity:

The property of a solid whereby it undergoes a permanent change in shape or size when subjected to a stress.

Polarized Light:

Light whose constituent transverse waves are all vibrating in the same plane.

Polaroid or polarizer:

A device that produces polarized light.

Positron:

An elementary particle having same mass as that of an electron but equal and positive charge.

Potential Energy:

The energy possessed by a body by virtue of its position or configuration.

Power:

The rate of doing work.

Pressure:

The force per unit area.

Primary colors:

"Three colors red

Principle quantum number:

A quantum number that describes the main energy level of an electron in terms of its most probable distance from the nucleus.

Progressive wave:

A wave which transfers energy from one part of a medium to another.

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