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  2. Fundamental frequency - Wikipedia

    en.wikipedia.org/wiki/Fundamental_frequency

    The fundamental is one of the harmonics. A harmonic is any member of the harmonic series, an ideal set of frequencies that are positive integer multiples of a common fundamental frequency. The reason a fundamental is also considered a harmonic is because it is 1 times itself. [11] The fundamental is the frequency at which the entire wave vibrates.

  3. Harmonic - Wikipedia

    en.wikipedia.org/wiki/Harmonic

    In physics, acoustics, and telecommunications, a harmonic is a sinusoidal wave with a frequency that is a positive integer multiple of the fundamental frequency of a periodic signal. The fundamental frequency is also called the 1st harmonic ; the other harmonics are known as higher harmonics .

  4. Basic research - Wikipedia

    en.wikipedia.org/wiki/Basic_research

    Basic research, also called pure research, fundamental research, basic science, or pure science, is a type of scientific research with the aim of improving scientific theories for better understanding and prediction of natural or other phenomena. [1]

  5. Harmonic series (music) - Wikipedia

    en.wikipedia.org/wiki/Harmonic_series_(music)

    Harmonics of a string showing the periods of the pure-tone harmonics (period = 1/frequency) The harmonic series (also overtone series) is the sequence of harmonics, musical tones, or pure tones whose frequency is an integer multiple of a fundamental frequency.

  6. Base unit of measurement - Wikipedia

    en.wikipedia.org/wiki/Base_unit_of_measurement

    A base unit of measurement (also referred to as a base unit or fundamental unit) is a unit of measurement adopted for a base quantity. A base quantity is one of a conventionally chosen subset of physical quantities , where no quantity in the subset can be expressed in terms of the others.

  7. List of physical quantities - Wikipedia

    en.wikipedia.org/wiki/List_of_physical_quantities

    Fundamental quantities Base quantity Symbol Description SI base unit Dimension Comments Length: l: The one-dimensional extent of an object metre (m) L: extensive: Mass: m: A measure of resistance to acceleration: kilogram (kg) M: extensive, scalar: Time: t: The duration of an event: second (s) T: scalar, intensive, extensive: Electric current: I

  8. Overtone - Wikipedia

    en.wikipedia.org/wiki/Overtone

    F is the fundamental frequency; the third overtone is the third harmonic, 3F, and the fifth overtone is the fifth harmonic, 5F for such a pipe, which is a good model for a pan flute. An overtone is a partial (a "partial wave" or "constituent frequency") that can be either a harmonic partial (a harmonic ) other than the fundamental, or an ...

  9. SI base unit - Wikipedia

    en.wikipedia.org/wiki/SI_base_unit

    The SI base units are a fundamental part of modern metrology, and thus part of the foundation of modern science and technology. The SI base units form a set of mutually independent dimensions as required by dimensional analysis commonly employed in science and technology. [citation needed]