Wavelengths of four electromagnetic radiations are given below. The radiation with highest frequency is.

1 λ1=0.2×10−9m=2×10−10m2λ2=2×10−12m3 λ3=20×10−10m=2×10−9m4 λ4=200×10−6m=2×10−4mv∝1λ∴ Frequency is highest when wave length is least.