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  2. Glossary of physics - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_physics

    A branch of physics that studies atoms as isolated systems of electrons and an atomic nucleus. Compare nuclear physics. atomic structure atomic weight (A) The sum total of protons (or electrons) and neutrons within an atom. audio frequency A periodic vibration whose frequency is in the band audible to the average human, the human hearing range.

  3. Family business - Wikipedia

    en.wikipedia.org/wiki/Family_business

    The "Global Family Business Index" [5] comprises the largest 500 family firms around the globe. In this index—published for a first time in 2015 by Center for Family Business University of St. Gallen and EY—for a privately held firm, a firm is classified as a family firm in case a family controls more than 50% of the voting rights. For a ...

  4. List of unsolved problems in physics - Wikipedia

    en.wikipedia.org/wiki/List_of_unsolved_problems...

    The following is a list of notable unsolved problems grouped into broad areas of physics. [1] Some of the major unsolved problems in physics are theoretical, meaning that existing theories seem incapable of explaining a certain observed phenomenon or experimental result.

  5. Family office - Wikipedia

    en.wikipedia.org/wiki/Family_office

    Chart of family office services. A family office is a privately held company that handles investment management and wealth management for a wealthy family, generally one with at least $50–100 million in investable assets, with the goal being to effectively grow and transfer wealth across generations.

  6. Perplexity - Wikipedia

    en.wikipedia.org/wiki/Perplexity

    The lowest perplexity that had been published on the Brown Corpus (1 million words of American English of varying topics and genres) as of 1992 is indeed about 247 per word/token, corresponding to a cross-entropy of log 2 247 = 7.95 bits per word or 1.75 bits per letter [5] using a trigram model. While this figure represented the state of the ...

  7. Scientific management - Wikipedia

    en.wikipedia.org/wiki/Scientific_management

    Horace Bookwalter Drury, in his 1918 work, Scientific management: A History and Criticism, identified seven other leaders in the movement, most of whom learned of and extended scientific management from Taylor's efforts: [4] Henry L. Gantt (1861–1919) Carl G. Barth (1860–1939) Horace K. Hathaway (1878–1944) Morris L. Cooke (1872–1960)

  8. Physical object - Wikipedia

    en.wikipedia.org/wiki/Physical_object

    A bubble of exhaled gas in water. In natural language and physical science, a physical object or material object (or simply an object or body) is a contiguous collection of matter, within a defined boundary (or surface), that exists in space and time.

  9. Physical property - Wikipedia

    en.wikipedia.org/wiki/Physical_property

    A physical property is any property of a physical system that is measurable. [1] The changes in the physical properties of a system can be used to describe its changes between momentary states. A quantifiable physical property is called physical quantity. Measurable physical quantities are often referred to as observables.