Optics Question 311
Question: An electromagnetic wave, going through vacuum is described by $ E=E _{0}\sin (kx-\omega t) $ . Which of the following is independent of wavelength
Options:
A) k
B) w
C) k/w
D) kw
Show Answer
Answer:
Correct Answer: C
Solution:
The angular wave number $ k=\frac{2\pi }{\lambda }; $ where l is the wave length. The angular frequency is $ w=2\pi \nu . $ The ratio $ \frac{k}{\omega }=\frac{2\pi /\lambda }{2\pi \nu }=\frac{1}{\nu \pi }=\frac{1}{c} $ = constant
