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  2. Amplitude - Wikipedia

    en.wikipedia.org/wiki/Amplitude

    For waves on a string, or in a medium such as water, the amplitude is a displacement. The amplitude of sound waves and audio signals (which relates to the volume) conventionally refers to the amplitude of the air pressure in the wave, but sometimes the amplitude of the displacement (movements of the air or the diaphragm of a speaker) is described.

  3. Wave - Wikipedia

    en.wikipedia.org/wiki/Wave

    A standing wave, also known as a stationary wave, is a wave whose envelope remains in a constant position. This phenomenon arises as a result of interference between two waves traveling in opposite directions. The sum of two counter-propagating waves (of equal amplitude and frequency) creates a standing wave. Standing waves commonly arise when ...

  4. List of equations in wave theory - Wikipedia

    en.wikipedia.org/wiki/List_of_equations_in_wave...

    The phase velocity is the rate at which the phase of the wave propagates in space. The group velocity is the rate at which the wave envelope, i.e. the changes in amplitude, propagates. The wave envelope is the profile of the wave amplitudes; all transverse displacements are bound by the envelope profile.

  5. Phase (waves) - Wikipedia

    en.wikipedia.org/wiki/Phase_(waves)

    When two signals with these waveforms, same period, and opposite phases are added together, the sum + is either identically zero, or is a sinusoidal signal with the same period and phase, whose amplitude is the difference of the original amplitudes. The phase shift of the co-sine function relative to the sine function is +90°.

  6. Triangle wave - Wikipedia

    en.wikipedia.org/wiki/Triangle_wave

    A triangle wave with period p and amplitude a can be expressed in terms of sine and arcsine (whose value ranges from −π/2 to π/2): = ⁡ (⁡ ()). The identity ⁡ = ⁡ can be used to convert from a triangle "sine" wave to a triangular "cosine" wave.

  7. Waveform - Wikipedia

    en.wikipedia.org/wiki/Waveform

    A sine, square, and sawtooth wave at 440 Hz A composite waveform that is shaped like a teardrop. A waveform generated by a synthesizer In electronics , acoustics , and related fields, the waveform of a signal is the shape of its graph as a function of time, independent of its time and magnitude scales and of any displacement in time.

  8. Wavelength - Wikipedia

    en.wikipedia.org/wiki/Wavelength

    A wave packet has an envelope that describes the overall amplitude of the wave; within the envelope, the distance between adjacent peaks or troughs is sometimes called a local wavelength. [21] [22] An example is shown in the figure. In general, the envelope of the wave packet moves at a speed different from the constituent waves. [23]

  9. Airy wave theory - Wikipedia

    en.wikipedia.org/wiki/Airy_wave_theory

    a is the wave amplitude in metres, cos is the cosine function, k is the angular wavenumber in radians per metre, related to the wavelength λ by k = ⁠ 2π / λ ⁠, ω is the angular frequency in radians per second, related to the period T and frequency f by ω = ⁠ 2π / T ⁠ = 2πf. The waves propagate along the water surface with the ...