Ace the 2025 DANB RHS Challenge – Radiate Confidence in Your Dental Journey!

The unit that measures the number of oscillations per second of electromagnetic radiation is frequency. Frequency refers to how many cycles of a wave occur in a given time frame, specifically in one second, and is expressed in hertz (Hz). In the context of electromagnetic radiation, a higher frequency corresponds to a greater number of oscillations occurring in that second, which is essential for understanding various phenomena such as light behavior, radio waves, and other forms of electromagnetic radiation.

The other choices pertain to different aspects of wave properties. A crest involves the highest point of a wave but does not measure oscillations. Wavelength measures the distance between successive peaks of a wave, while Bremsstrahlung is a type of radiation produced when charged particles are decelerated or deflected. These concepts are related but do not represent the oscillatory nature of electromagnetic radiation itself like frequency does.