What effect does an increase in frequency have on electromagnetic waves?

• A. It increases their speed
• B. It decreases their wavelength
• C. It reduces their energy
• D. It alters their medium of travel

Answer: (B)

An increase in frequency of electromagnetic waves indeed leads to a decrease in their wavelength. This relationship is described by the wave equation, which states that the speed of a wave is equal to its frequency multiplied by its wavelength. For electromagnetic waves, this speed is constant in a vacuum, approximately 299,792 kilometers per second. Therefore, if the frequency increases while the speed remains constant, the wavelength must decrease to maintain the equation's balance.

Understanding this concept is crucial, as it helps to clarify the properties of electromagnetic waves across various parts of the spectrum, from radio waves at low frequencies and long wavelengths to gamma rays at high frequencies and short wavelengths. This fundamental principle illustrates how electromagnetic radiation behaves and is a key concept in the study of physics and engineering related to light and wave phenomena.