An electromagnetic wave going through vacuum is described by $$ E=E_{0} \sin (k x-\omega t) $$ Which of the following is/are independent of the wavelength?

• A

  $\mathrm{k}$
• B

  $\omega^{2}$
• Correct answer
  C

  $\mathrm{k} / \omega$
• D

  $k \omega^{2}$

Hence, the correct answer is option: 'C'.