How can "25 million cycles per second" be expressed?

The phrase "25 million cycles per second" can be expressed in terms of hertz, which is the standard unit for measuring frequency. Since "hertz" (Hz) is defined as one cycle per second, we can apply the appropriate metric prefixes to express larger values.

The term "megahertz" (MHz) represents one million hertz. Therefore, to convert 25 million cycles per second into megahertz, you divide by one million:

25,000,000 Hz = 25 MHz.

Thus, the correct expression for 25 million cycles per second is 25 megahertz. This clearly aligns with the scientific understanding of frequency conversion and the use of metric prefixes in telecommunications and electronics fields, where megahertz is commonly used to describe frequency ranges.