Electromagnetic Waves Summary Page

Speed of light

c = $\omega$/k = ($\epsilon$₀$\mu$₀)^-1/2

Speed of light in terms of wave length and frequency

c = $\lambda\nu$

Speed of light in a medium

v = c / n

Total energy density of an electromagnetic wave

U = $\epsilon$₀ E² = B²/$\mu$₀

Momentum of an electromagnetic wave

p = U/c = $\epsilon$₀ E²/c= B²/c$\mu$₀

Power per unit area (Irradiance)

S = cU= c$\epsilon$₀ E² = cB²/$\mu$₀

Pressure of an electromagnetic wave

p = U / c (for total absorption of U)
p = 2U / c (for total reflection of U)

Wavelength of visible light

400 to 700 nm

Speed of light	c = $\omega$/k = ($\epsilon$₀$\mu$₀)^-1/2
Speed of light in terms of wave length and frequency	c = $\lambda\nu$
Speed of light in a medium	v = c / n
Total energy density of an electromagnetic wave	U = $\epsilon$₀ E² = B²/$\mu$₀
Momentum of an electromagnetic wave	p = U/c = $\epsilon$₀ E²/c= B²/c$\mu$₀
Power per unit area (Irradiance)	S = cU= c$\epsilon$₀ E² = cB²/$\mu$₀
Pressure of an electromagnetic wave	p = U / c (for total absorption of U) p = 2U / c (for total reflection of U)
Wavelength of visible light	400 to 700 nm