The Learning Track

Absolute zero:

The temperature of - 273.16 or 0 K at which molecular motion vanishes.

Absorptance:

The ratio of the total absorbed radiation to the total incident radiation.

Acceleration due to gravity:

The acceleration imparted to bodies by the attractive force of the earth or any other heavenly body.

Acceleration:

The rate of change of velocity with respect to time.

Achromatic:

Capable of transmitting light without decomposing it into its constituent colors.

Acoustic shielding:

A sound barrier that prevents the transmission of acoustic energy.

Acoustics:

"The science of the production

Adiabatic:

Any change in which there is no gain or loss of heat.

Afocal lens:

"A lens of zero convergent power

Albedo:

"The fraction of the total light incident on a reflecting surface

Alpha particle:

The nucleus of a helium atom (two protons and two neutrons) emitted as radiation from a decaying heavy nucleus.

Alternating current:

The electric current that changes its direction periodically.

Amorphous:

Solids which have neither definite form nor structure.

Ampere:

"S.I. Unit of electric current

Amplitude:

The maximum absolute value attained by the disturbance of a wave or by any quantity that varies periodically.

Angle of contact:

"The angle between tangents to the liquid surface and the solid surface inside the liquid

Angle of incidence:

The angle between the incident ray and the normal.

Angle of reflection:

The angle between the reflected ray and the normal.

Angle of refraction:

The angle between the refracted ray and the normal.

Angle of repose:

The angle of inclination of a plane with the horizontal such that a body placed on the plane is at the verge of sliding.

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