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| radiation in the form of elementary particles emitted by an atomic nucleus produced by decay of radioactive substances or by nuclear fission |
| the branch of physics that deals with sound and sound waves |
| kilohertz (kĭl'ə-hûrts') Pronunciation Key
A unit of frequency equal to 1,000 cycles per second (1,000 hertz). It is used in the measurement of radio, sound, and other waves. |