Wavelengths of different radiations are given below.

λ (A)=300nm λ (B)=300μm λ (C)=3nm λ (D)=30Å

Arrange the radiations in the increasing order of their energies.


λ (A)=300nm=300×10-9 m
λ (B)=300μm=300×10-6 m
λ (C)=3nm=3×10-9 m
λ (D)=30Å=30×10-10 m=3×10-9 m
Energy, E=hcλ
Therefore, E1λ
Increasing order of energy is B<A<C=D