Question

In electromagnetic wave how is frequency, wavelength and amplitude related if electric field oscillates sinusoidally

Answer 1

Answer:

(a) wavelength of electromagnetic wave is

here, c is speed of light .e.g.,c = 3 × 10^8 m/s

v is the frequency .e.g., v = 2 × 10^10 Hz

so, =3 × 10^8/2 × 10^10

= 1.5 × 10^-2 m = 1.5 cm

(b) amplitude of magnetic field is given by

(c) Energy density as electric field,

here,

so,

also we know, speed of electromagnetic wave,

so,

here,  is energy density as magnetic field.