Identify the correct relation for frequencies ν₁, ν₂, and ν₃ for the incident radiation of given intensity I.
a) ν₁ < ν₂ < ν₃
b) ν₁ > ν₂ > ν₃
c) ν₁ = ν₂ = ν₃
d) ν₁ = ν₂ < ν₃