Apply this equation to find the blue light's frequency:
c = fλ
c = speed of light in a vacuum, f = frequency, λ = wavelength
Given values:
c = 3×10⁸m/s, λ = 4.75×10⁻⁹m
Plug in and solve for f:
3×10⁸ = f(4.75×10⁻⁹)
f = 63.2 petahertz
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