Expression of electric field and magnetic field
E = Eo sin (ωt – kx)
B = Bo sin (ωt – kx)
- E = Electric field
- Eo = Amplitude of electric
- B = Magnetic field
- Bo = Amplitude of Magnetic field
- t = time
- ω = Angular frequency
- x = distance
Velocity of electromagnetic wave
(i) c = 1\over \sqrt{\mu_o \epsilon _o}
(ii) c = E\over B=E_o\over B_o
where
- μo = 4π × 10-7 N C-2 s2
- ε0 = 8.854 ×10-12 C2 N-1 m-2
The energy density of an electromagnetic field
u = {1\over 2}\epsilon _o {E_o}^2
u = {1\over 2 \mu_o}{B_o}^2
- u = Energy density
- μo = 4π × 10-7 N C-2 s2
- ε0 = 8.854 ×10-12 C2 N-1 m-2
Intensity of Radiation and radiation pressure
I = c × u
p = {1\over 3}u
- I = Intensity of radiation
- p = Radiation pressure
