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hertz
(Encyclopedia)hertz hûrts [key] [for Heinrich R. Hertz], abbr. Hz, unit of frequency, equal to 1 cycle per second. The term is combined with metric prefixes to denote multiple units such as the kilohertz (1,000 Hz...Hertz, Gustav
(Encyclopedia)Hertz, Gustav go͝osˈtäf hĕrts [key], 1887–1975, German physicist. He is noted for his work on the atom, and he shared with James Franck the 1925 Nobel Prize in Physics for research (1914) on the...Hertz, Heinrich Rudolf
(Encyclopedia)Hertz, Heinrich Rudolf hĕrts [key], 1857–94, German physicist. He confirmed J. C. Maxwell's electromagnetic theory and in the course of experiments (1886–89) produced and studied electromagnetic...Marconi, Guglielmo, Marchese
(Encyclopedia)Marconi, Guglielmo, Marchese go͞olyĕlˈmō märkāˈzā märkôˈnē [key], 1874–1937, Italian physicist, celebrated for his development of wireless telegraphy (see radio). In the field of electro...Franck, James
(Encyclopedia)Franck, James frängk [key], 1882–1964, German physicist. He was professor of physics at Göttingen and at Johns Hopkins (1935–38) and professor of physical chemistry at the Univ. of Chicago from ...San Francisco Symphony
(Encyclopedia)San Francisco Symphony, orchestra founded 1911. It has performed at the Louise M. Davies Symphony Hall since 1980. Henry Hadley, the original music director, was followed by Alfred Hertz (1915–30), ...gamma radiation
(Encyclopedia)gamma radiation, high-energy photons emitted as one of the three types of radiation resulting from natural radioactivity. It is the most energetic form of electromagnetic radiation, with a very short ...photoelectric effect
(Encyclopedia)photoelectric effect, emission of electrons by substances, especially metals, when light falls on their surfaces. The effect was discovered by H. R. Hertz in 1887. The failure of the classical theory ...ultraviolet radiation
(Encyclopedia)ultraviolet radiation, invisible electromagnetic radiation between visible violet light and X rays; it ranges in wavelength from about 400 to 4 nanometers and in frequency from about 1015 to 1017 hert...motor, electric
(Encyclopedia)CE5 Motor: In the AC motor, current fed to the conducting loop of wire causes it to rotate in the magnetic field, thus turning the shaft on which the loop is mounted. In the DC motor, the direction...Browse by Subject
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