Final answer:
The term 'Megahertz' (MHz) represents one million cycles per second and is used to measure processor speed or machine cycles per second.
Step-by-step explanation:
The measurement of machine cycles per second, used also to measure processor speed, is referred to in units of Hertz. The correct answer to the student's question is Megahertz (MHz). This is because Megahertz represents one million cycles per second. Multiplicative prefixes like mega-, giga-, and tera- are used to indicate the scale of Hz when measuring frequency.
For example, Gigahertz (GHz) is used to express billion cycles per second. Therefore, the unit for one million bytes is Megabyte, not to be confused with Megahertz, which measures frequency. In the context of computer memory and storage, kilobyte refers to 1,024 bytes, and one Terabyte (TB) is equivalent to 1,024 Gigabytes (GB).