beat note,difference-tone
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- kennelly heaviside layer
- relativistic astrophsics
- vapor pressure
- magnetic induction flux
- conical pendulum
- deflection field
- trichromatic equation
- early-type star
- distributed ion pump
- viscous solid
- ceiling light
- complex refractive index
- residual heat
- sturm liouville equation
- disjoining pressure
- algebraic
- Four-dimension Momentum
- capillary electrical phenomenon
- particle-number operator
- ritz formula