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United States electrical engineer noted for his work on the theory of alternating currents; independently of Oliver Heaviside he discovered the existence of an atmospheric layer that reflects radio waves back to earth (1861-1939) A. E. Kennelly , Arthur Edwin Kennelly , Kennelly
delay line based on the time of propagation of sound waves acoustic delay line , sonic delay line
medium that was once supposed to fill all space and to support the propagation of electromagnetic waves aether , ether
sound waves in speaker, preventer of interference of baffle
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
in a condition in which brain waves are not detectable brain-dead
waves breaking on the shore breaker , breakers , surf
wall to break force of waves breakwater
shoreline barrier to break waves breakwater
microphone consisting of a capacitor with one plate fixed and the other forming the diaphragm moved by sound waves capacitor microphone , condenser microphone
hollow chamber whose dimensions allow the resonant oscillation of electromagnetic or acoustic waves cavity resonator , resonating chamber , resonator
irregular motion of waves (usually caused by wind blowing in a direction opposite to the tide) chop
abounding in small waves choppy
curls or waves, to press into tight crimp
microphone in which sound waves vibrate a piezoelectric crystal that generates a varying voltage crystal microphone
biconvex transparent body situated behind the iris in the eye; it focuses light waves on the retina crystalline lens , lens
lowest region of the ionosphere (35 to 50 miles up) that reflects low-frequency radio waves D-layer , D region
United States electrical engineer who in 1907 patented the first triode vacuum tube, which made it possible to detect and amplify radio waves (1873-1961) De Forest , Father of Radio , Lee De Forest
electro-acoustic transducer that vibrates to receive or produce sound waves diaphragm
light waves into colors of rainbow, breaking up of diffraction
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