Final answer:
Electromagnetic energy is unique as it travels as radiation waves, which do not require a physical medium to propagate and have a constant speed known as the speed of light in a vacuum.
Step-by-step explanation:
Electromagnetic energy is unique because it travels in the form of radiation waves. This means the correct answer to the question is (d) Radiation waves. Unlike sound waves, which require a medium such as air or water to travel through, electromagnetic waves do not require a physical medium and can move through empty space.
The speed of these waves in a vacuum is a constant, known as the speed of light (c), and measures approximately 3.00 × 10⁸ m/s. Electromagnetic waves exhibit wavelike properties, characterized by their frequency (v) and wavelength (λ), with the relationship c = λv. They also have particle-like properties, represented by photons, with the energy of a photon being proportional to its frequency, as expressed by Planck's law E = hv.
Electromagnetic energy is unique because it travels in the form of radiation waves.
Electromagnetic radiation, such as light, moves through a vacuum with a constant speed, c, of 2.998 × 10^8 m/s. This radiation shows wavelike behavior, characterized by a frequency, v, and a wavelength, λ, such that c = λv.
Examples of electromagnetic radiation include X-rays, visible light, microwaves, and radio waves. Each type of electromagnetic radiation travels at a particular wavelength, with shorter wavelengths carrying more energy.
Therefore the correct option is (d) Radiation waves.