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  2. Cymatics - Wikipedia

    en.wikipedia.org/wiki/Cymatics

    Experiments of this kind, similar to those carried out earlier by Galileo Galilei [4] around 1630 and by Robert Hooke in 1680, were later perfected by Chladni, who introduced them systematically in 1787 in his book Entdeckungen über die Theorie des Klanges (Discoveries on the theory of sound). This provided an important contribution to the ...

  3. Acoustic theory - Wikipedia

    en.wikipedia.org/wiki/Acoustic_theory

    Acoustic theory is a scientific field that relates to the description of sound waves.It derives from fluid dynamics.See acoustics for the engineering approach.. For sound waves of any magnitude of a disturbance in velocity, pressure, and density we have

  4. Music and mathematics - Wikipedia

    en.wikipedia.org/wiki/Music_and_mathematics

    Thus the major third is considered not a third but a ditone, literally "two tones", and is (9:8) 2 = 81:64, rather than the independent and harmonic just 5:4 = 80:64 directly below. A whole tone is a secondary interval, being derived from two perfect fifths minus an octave, (3:2) 2 /2 = 9:8.

  5. BBC Bitesize - Wikipedia

    en.wikipedia.org/wiki/BBC_Bitesize

    The Key Stage 1, 2 and 3 along with GCSE section covers a range of subjects. In Key Stage 1 , 17 subjects are available, including Art and Design , Computing , Design and Technology , English , Geography , History , Maths , Music , Physical Education , PSHE , Citizenship , Religious Education , Science , and Modern Foreign Languages . [ 5 ]

  6. Worksheet - Wikipedia

    en.wikipedia.org/wiki/Worksheet

    The form comes with two worksheets, one to calculate exemptions, and another to calculate the effects of other income (second job, spouse's job). The bottom number in each worksheet is used to fill out two if the lines in the main W4 form. The main form is filed with the employer, and the worksheets are discarded or held by the employee.

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