The energy of electromagnetic waves is inversely proportional to their wavelength. This means that shorter wavelengths correspond to higher energy.
Let's compare the wavelengths of the electromagnetic waves from the table:
- A: \( 1.0 \times 10^{3} , \text{m} \)
- B: \( 2.0 \times 10^{-9} , \text{m} \)
- C: \( 3.5 \times 10^{-6} , \text{m} \)
- D: \( 1.8 \times 10^{-12} , \text{m} \)
Among these:
- Wave B has the shortest wavelength, at \( 2.0 \times 10^{-9} , \text{m} \).
- Wave D has the second shortest wavelength, at \( 1.8 \times 10^{-12} , \text{m} \).
- Wave C is longer than both B and D.
- Wave A has the longest wavelength.
Since Wave D is even shorter than Wave B, it has the highest energy.
Therefore, the answer is D.