I=P/(4πR²)

Calculator:
Intensity of waves at a distance R from a point source of power P, which radiates waves uniformly in all directions.
Equation: I=P/(4πR²)

P =
R =

Maximum electric field strength E₀ = (2⋅I⋅ c⁻¹ ⋅ ε₀⁻¹)½ =
The speed of light c = 299792458 m/s
Vacuum Permittivity ε₀ = 8.8541878128 × 10⁻¹² F⋅m⁻¹

₀₁₂₃₄₅₆₇₈₉₊₋₌₍₎ₐₑₒₓₔₕₖₗₘₙₚₛₜ⁻ⁱ⁻⁰⁻¹⁻²⁻³⁻⁴⁻⁵⁻⁶⁻⁷⁻⁸⁻⁹⁺⁻ΑΒΓΔΕΖΗΘΙΚΛΜΝΞΟΠΡΣΤΥΦΧΨΩαβγδεζηθικλμνξοπρςστυφχψωc = 299792458 m/s

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