Answer:
Wavelength of the wave is [tex]1.7[/tex] meter
Explanation:
As we know that
[tex]c = \lambda *v[/tex]
C is the speed of light
[tex]\lambda[/tex] is the wavelength of light
v is the frequency of the light
Substituting the given values in above equation, we get -
[tex]680 = \lambda * 400[/tex]
[tex]\lambda = \frac{680}{400}\\ \lambda = 1.7[/tex] m
