True or False: Longer wavelengths have more energy.

• A. True
• B. False
• C. Only in vacuum
• D. Depends on the observer

Answer: (B)

Longer wavelengths correspond to lower frequencies in the electromagnetic spectrum, and as a result, they possess less energy. The relationship between energy, wavelength, and frequency is described by the equation ( E = hf ), where ( E ) is energy, ( h ) is Planck’s constant, and ( f ) is frequency. Since frequency and wavelength have an inverse relationship (as one increases, the other decreases), longer wavelengths—such as those found in radio waves—have lower energy compared to shorter wavelengths, like gamma rays, which have higher energy due to their higher frequencies. Therefore, the statement asserting that longer wavelengths have more energy is false.