• Afocal lens
  • Alpha particle
  • Amorphous: Solids which have neither definite form nor structure. Ampere
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    Acoustic shielding:

    A sound barrier that prevents the transmission of acoustic energy.

    Adiabatic:

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

    Afocal lens:

    A lens of zero convergent power, whose focal points are infinitely distant.

    Albedo:

    The fraction of the total light incident on a reflecting surface, especially a celestial body, which is reflected back in all directions.

    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, one ampere is the flow of one coulomb of charge per second.

    Amplitude:

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



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