Radiation Pressure Study Documents | Lecture Note - Edubirdie

University:
Santa Fe College
Course:
ETS 2527C | Electromechanical Components and Mechanisms
Academic year:

2024
Views:

94

Pages:

5
Author:

Jabin F.

Radiation Pressure (i) If radiation or E.M wave incident normally on a surface: (θi = 0) (a) If medium is perfectly absorbing: (ex. Black-body surface) Reflection Coefficient (R) = 0 Absorption Coeff (A) = 1 Radiation Pressure Pp = I/c I = intensity (b) If medium is perfectly reflecting: (ex. metals) or conductor. Pp = 2I/c (ii) If E.M wave is incident obliquely (θi ≠ 0) [θi = 0 for normal incident] Intensity I = I₀ cos² θi I₀ = Intensity for normal incident = cSE/2 Radiation Pressure For perfectly absorbing → Pp = (I₀ cos² θ₁) / c For perfectly reflecting → Pp = (2I₀ cos² θ₁) / c I₀ = (1/2) * cε₀E₀² for plane wave Ques. 61 Page-76 Free space: E(r,t) = E₀e^(-kz) * cos(kzn - ωt)ŷ B(r,t) = (E₀/ω)e^(-kz) * [k₁sin(kzn - ωt)ŷ + k₂cos(kzn - ωt)ẑ] Average power < S > = (1/μ₀) * For direction ŷ: E x B = (E_x * B_z) - (E_z * B_x) = k₁ + k₂ For x-direction, we will choose ŷ factor = (E₀²/ω) * e^(-2kz) * cos²[k₂n - ωt]ŷ = (E₀² * k₂) / (ω² * e^(2kz)) = (E₀² * k₂) / (2μ₀ω) (map value option-a) If ŷ → ẑ = (E₀² * k₁) / (μ₀ω) * = 0

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