The second radiation is less energetic than the former because it has a longer wavelength.
Recall that;
c = λf
c = Speed of light
λ = wavelength
f = Frequency
Now;
λ = c/f = 3 × 10^8 m/s/6.00 x 10^13 s-1
λ = 5 × 10^-6 m
Also;
When f = 5.40 x 10^13 s^-1
λ = c/f = 3 × 10^8 m/s/5.40 x 10^13 s^-1
λ = 5.6 × 10^-6 m
This radiation is less energetic than the former because it has a longer wavelength.
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