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distribution of energy as a function of frequency for a particular sound source acoustic spectrum , sound spectrum
normal brainwave in the electroencephalogram of a person who is awake but relaxed; occurs with a frequency of 8-12 hertz alpha rhythm , alpha wave
atomic clock based on vibrational frequency of the nitrogen atom in the ammonia molecule ammonia clock
frequency with which a person is present attendance
audible acoustic wave frequency audio , audio frequency
single pulsation of an oscillation produced by adding two waves of different frequencies; has a frequency equal to the difference between the two oscillations beat
normal brainwave in the encephalogram of a person who is awake and alert; occurs with a frequency between 12 and 30 hertz beta rhythm , beta wave
painless contractions of the muscles of the uterus that continue throughout pregnancy with increasing frequency Braxton-Hicks contraction , false labor
radio-frequency transmitter that sends and receives spoken signals CB radio
radio frequency band for private communications CB , citizens band
transmission line for high-frequency signals coax , coax cable , coaxial cable
large proton synchrotron; uses frequency modulation of an electric field to accelerate protons cosmotron
frequency per minute count per minute , counts/minute
unit of frequency; one hertz has a periodic interval of one second cps , cycle , cycle per second , cycles/second , hertz , Hz
oscillator that produces electrical oscillations at a frequency determined by the physical characteristics of a piezoelectric quartz crystal crystal oscillator , quartz oscillator
lowest region of the ionosphere (35 to 50 miles up) that reflects low-frequency radio waves D-layer , D region
(statistics) an unrestricted variable in a frequency distribution degree of freedom
normal brainwave in the encephalogram of a person in deep dreamless sleep; occurs with high voltage and low frequency (1 to 4 hertz) delta rhythm , delta wave
method of physical therapy that involves generating local heat in body tissues by high-frequency electromagnetic currents diathermy
heating of an insulator by a high-frequency electric field dielectric heating
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