Definition. The hertz is defined as one cycle per second.The International Committee for Weights and Measures defined the second as "the duration of 9 192 631 770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the caesium-133 atom" and then adds: "It follows that the hyperfine splitting in the ground state of the caesium 133 ...
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The hertz (symbol: Hz, definition: 1/s) is a unit derived from time which measures frequency in the International System of Units (SI). Frequency is how often something happens. A frequency of 1 hertz means that something happens once a second. The note Middle C (the C in the middle of the piano) is 261.65 (262) Hz.
Hertz (surname), German surname and list of persons with the name Heinrich Hertz , (1857–1894), German physicist after whom the unit of frequency, hertz was named Hertz Nazaire (born 1973), Haitian paint artist and author
- Scientific work
- Nazi persecution
- Legacy and honors
Heinrich Rudolf Hertz was a German physicist who first conclusively proved the existence of the electromagnetic waves predicted by James Clerk Maxwell's equations of electromagnetism. The unit of frequency, cycle per second, was named the "hertz" in his honor.
Heinrich Rudolf Hertz was born in 1857 in Hamburg, then a sovereign state of the German Confederation, into a prosperous and cultured Hanseatic family. His father was Gustav Ferdinand Hertz. His mother was Anna Elisabeth Pfefferkorn. While studying at the Gelehrtenschule des Johanneums in Hamburg, Hertz showed an aptitude for sciences as well as languages, learning Arabic and Sanskrit. He studied sciences and engineering in the German cities of Dresden, Munich and Berlin, where he studied under
In 1864 Scottish mathematical physicist James Clerk Maxwell proposed a comprehensive theory of electromagnetism, now called Maxwell's equations. Maxwell's theory predicted that coupled electric and magnetic fields could travel through space as an "electromagnetic wave". Maxwell p
In 1892, Hertz began experimenting and demonstrated that cathode rays could penetrate very thin metal foil. Philipp Lenard, a student of Heinrich Hertz, further researched this "ray effect". He developed a version of the cathode tube and studied the penetration by X-rays of vario
Hertz helped establish the photoelectric effect when he noticed that a charged object loses its charge more readily when illuminated by ultraviolet radiation. In 1887, he made observations of the photoelectric effect and of the production and reception of electromagnetic waves, p
Heinrich Hertz was a Lutheran throughout his life and would not have considered himself Jewish, as his father's family had all converted to Lutheranism when his father was still in his childhood in 1834. Nevertheless, when the Nazi regime gained power decades after Hertz's death, its officials removed his portrait from its prominent position of honor in Hamburg's City Hall because of his partly Jewish ancestry. Hertz's widow and daughters left Germany in the 1930s and settled in England.
Heinrich Hertz's nephew Gustav Ludwig Hertz was a Nobel Prize winner, and Gustav's son Carl Helmut Hertz invented medical ultrasonography. His daughter Mathilde Carmen Hertz was a well-known biologist and comparative psychologist. Hertz's grandnephew Hermann Gerhard Hertz, professor at the University of Karlsruhe, was a pioneer of NMR-spectroscopy and in 1995 published Hertz's laboratory notes. The SI unit hertz was established in his honor by the International Electrotechnical Commission in 193
- Scientific memberships
Gustav Ludwig Hertz was a German experimental physicist and Nobel Prize winner for his work on inelastic electron collisions in gases, and a nephew of Heinrich Rudolf Hertz. Gustav Ludwig Hertz Hertz in 1925 Born22 July 1887 Free Hanseatic city of Hamburg, German Empire Died30 October 1975 East Berlin, East Germany NationalityGerman Alma materHumboldt University of Berlin Known forFranck–Hertz experiment AwardsNobel Prize in Physics Max Planck Medal Scientific career FieldsPhysics...
Hertz was born in Hamburg, the son of Auguste and a lawyer, Gustav Theodor Hertz, Heinrich Rudolf Hertz' brother. He attended the Gelehrtenschule des Johanneums before studying at the Georg-August University of Göttingen, the Ludwig Maximilian University of Munich, and the Humboldt University of Berlin. He received his doctorate in 1911 under Heinrich Leopold Rubens. From 1911 to 1914, Hertz was an assistant to Rubens at the University of Berlin. It was during this time that Hertz and ...
Hertz was a Member of the German Academy of Sciences in Berlin, Corresponding Member of the Göttingen Academy of Sciences, an Honorary Member of the Hungarian Academy of Sciences, a Member of the Czechoslovakian Academy of Sciences, and a Foreign Member of the USSR Academy of Sciences.
- Personal life
Jessica Hertz is an American attorney and political advisor who is the White House Staff Secretary in the Biden administration. Hertz previously served as general counsel for the Presidential transition of Joe Biden and associate general counsel at Facebook.
Hertz earned a Bachelor of Arts degree from Harvard University and a Juris Doctor from the University of Chicago Law School. As a law student, she was the articles editor of the University of Chicago Law Review.
Hertz worked as a law clerk for judges Sonia Sotomayor and Barbara S. Jones. From 2009 to 2011, she was counselor to the administrator of the Office of Information and Regulatory Affairs. In 2011 and 2012, she was counselor to the United States Deputy Attorney General. She served as principal deputy counsel to then-Vice President Joe Biden from 2012 to 2014. After leaving the Obama administration in 2014, Hertz became a partner at Jenner & Block. In April 2018, she joined Facebook as the company
Hertz is married to Christopher Angell, an attorney working as a business manager at Oracle.
John Daniel Hertz, Sr. (April 10, 1879 – October 8, 1961) was an American businessman, thoroughbred racehorse owner and breeder, and philanthropist. John D. Hertz Hertz in 1899
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