Question

An electromagnetic wave going through vacuum is described by
E = E0 sin (kx − ωt).
Which of the following is/are independent of the wavelength?
(a) k
(b) ω
(c) k/ω
(d) kω

Answer 1

(c) k/ω

The given quantities can be expressed as:

k is given by

k=2πλ

ω is given by

ω=2πνc=νλ⇒ω=2πcλ

k/ω is given by 

kω=2π/λ2πc/λ=1c

kω is given by

k×ω=2πλ×2πcλ=4π2cλ2

Thus, k/ω is independent of the wavelength.

Answer 2

Answer:

this is a your answer to the question answer