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What is the Definition and Meaning of the Frequency Megahertz (MHz)?

# What is the Definition and Meaning of the Frequency Megahertz (MHz)?

So, what exactly is the frequency Megahertz (MHz), what’s its definition and meaning, and how does this all work in real life?

Well, if you’re a curious person and want to know all the gritty details, let’s get right into it!

## What Does MHz Mean?

First, what does MHz mean, and what is it exactly? MHz stands for Megahertz, and it’s a unit of frequency and a part of the “Hertz” measurement family.

What is Hertz, you ask? The International Electrotechnical Committee first coined the term Hertz in 1930 after the German physicist, Heinrich Hertz (1857–1894), investigated electromagnetism and refined Maxwell’s electromagnetic theory of light. This led to him establishing the existence of electromagnetic waves.

Simply put, Hertz is used to describe electrical signals or electrical field frequencies. These include electromagnetic fields, radio signals, and more. It is defined as the number of cycles per second of any oscillating or repeating phenomena.

Megahertz, on the other hand, is a specific measurement and means one million cycles per second.

## What Does Megahertz Measure?

Hertz measures the cycles per second of specific items. So, one Hertz is one cycle per second.

Megahertz is a frequency unit, so it’s part of the Hertz measurement. Think about it this way: one cycle per second is one Hertz (Hz), and one million (1,000,000) Hz is equivalent to one MHz. That’s a lot of Hertz!

### What Does Hertz Do and How Does it Help Anything?

The number of oscillations, cycles, and events that take place in a second are measured in Hertz, also known as the SI unit of frequency. It determines the frequency of periodic oscillations and events. Some examples include the frequency of sound waves, electromagnetic waves, lines, and CPU clock rates (more on that below).

## What Power is Megahertz?

One million Hertz is represented by the unit multiplier known as the Megahertz (MHz) (10^6 Hz). So, technically, Megahertz is to the 6th power of Hertz.

## What is the Difference Between Hz and MHz?

The only difference between Hz and MHz is that a Megahertz is 1 million Hertz. So, it’s just a higher measurement.

## What are the Other Hertz Levels?

Besides Hertz, there are Kilohertz, Megahertz, and Gigahertz. These are widely used for convenience to designate much higher frequencies. And no, you can’t actually hear some of them! Crazy, right?

For example, anything over 10GHz can usually only be heard as a hissing type sound by some people, not all. Most of our ears just aren’t equipped for that!

## How It All Works

The EM spectrum contains frequencies from a few Hertz to many septillions (1025Hz or more). The radio wave range at the lower end of the electromagnetic spectrum includes those with frequencies between 1MHz and 999MHz.

As an example, Megahertz measures sound waves that are higher than the 20Hz to 20kHz range of human hearing. Ultrasound is a category of sounds with a frequency of more than 20kHz and up to 200MHz.

Did you know that the transmission speed of electrical devices, including computer buses, RAM, and CPUs is also in MHz? This is why being able to measure in Hertz and Megahertz is so important!

How much is 1 MHz?

1 Megahertz is equal to 1 million Hertz.

How many MHz is the human brain?

Some studies show that the average electric field intensity in the brain is around 300 to 600MHz.

What is better, higher or lower MHz?

There really is no “better,” but the higher the MHz, the faster the speed. So, if speed is what you want, then you want higher MHz!

Do thoughts have a frequency?

Technically, yes, they do! While these aren’t necessarily “physical,” your thoughts and feelings have frequency, just like everything else on Earth.

What is a cycle in Hertz?

The frequency of the wave is defined as the number of crests that cross a specific place in one second. One Hertz is one wave, or cycle, each second (Hz).

#### Kim Studdard, Author for History-Computer

Kim Studdard is a writer at History-Computer, where her primary focus is on the best technology for consumers. Kim has been writing about technology, personal finance, and motherhood while freelancing for over 7 years and is currently working on her Bachelor’s Degree in Operations Management. A resident of Kansas, Kim enjoys reading, spending time with her family and multiple pets, and being a coffee snob.