What is the wavelength of blue light if it has a frequency of 6.67 x 1014 sec (Hz)?

We know that for any kind of waves, the  wavelength
multiplied by its frequency is equal to its speed. That
is:

Wavelength x Frequency =
Speed

Or

Wavelength =
Speed/Frequency

The speed of light in vacuum is 299,792,000
meters per second.

Substituting the given value of speed of
light and the given value of frequency in the above equation for
wavelength:

Wavelength =
299,792,000/(6.67x10^14)

= 4494.6327x10^(-10)
meters

Answer:

Wavelength of
blue light = 4494.6327x10^(-10) meters