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