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where f r is the resonant frequency Δf is the resonance width or full width at half maximum (FWHM) i.e. the bandwidth over which the power of vibration is greater than half the power at the resonant frequency, ω r = 2πf r is the angular resonant frequency, and Δω is the angular half-power bandwidth. Under this definition, Q is the ...
The definitions for monopoles are of theoretical interest, although real magnetic dipoles can be described using pole strengths. There are two possible units for monopole strength, Wb (Weber) and A m (Ampere metre). Dimensional analysis shows that magnetic charges relate by q m (Wb) = μ 0 q m (Am).
where F 0 is the resonant frequency of the second-order filter. BW is the bandwidth expressed in the same frequency unit that F 0 is. Low Q filter responses (where Q < 1 ⁄ 2) are not said to be resonant and the above formula for bandwidth does not apply. It is also possible to define the Q of a band-pass function as:
For Faraday's first law, M, F, v are constants; thus, the larger the value of Q, the larger m will be. For Faraday's second law, Q, F, v are constants; thus, the larger the value of (equivalent weight), the larger m will be. In the simple case of constant-current electrolysis, Q = It, leading to
Lorentz force F on a charged particle (of charge q) in motion (instantaneous velocity v). The E field and B field vary in space and time. The force F acting on a particle of electric charge q with instantaneous velocity v , due to an external electric field E and magnetic field B , is given by ( SI definition of quantities [ 1 ] ): [ 12 ]
The equivalent rectangular bandwidth or ERB is a measure used in psychoacoustics, which gives an approximation to the bandwidths of the filters in human hearing, using the unrealistic but convenient simplification of modeling the filters as rectangular band-pass filters, or band-stop filters, like in tailor-made notched music training (TMNMT).
The term alternating current applies to a voltage vs. time function that is sinusoidal with a frequency f. When it is applied to a typical (linear time-invariant) circuit or device, it causes a current that is also sinusoidal. In general there is a constant phase difference φ between any two sinusoids. The input sinusoidal voltage is usually ...
The Q-bandwidth is a measure of the frequency bandwidth over which the modes in a reverberation chamber are correlated. The B W Q {\displaystyle {\rm {BW}}_{Q}} of a reverberation chamber can be calculated using the following: