Answer:
The right option is B
Explanation:
The frequency of the wave is given by the following formula:
[tex]f = \dfrac{c}{\lambda} [/tex]
where,
f = frequency of the wave.
c = speed of the light.
λ = wavelength of the light.
[tex]\lambda = \dfrac{c}{f} [/tex]
[tex]\lambda = \dfrac{3\times10^{8}}{2.5\times10^{14}}[/tex]
[tex]\lambda = 1.2 \times 10^{-6}[/tex]
Therefore the correct option is B.
