Naked Universe of Ana

What is an electron-volt, and why do we need it?

Added 2025-01-26 18:42:18 +0000 UTC

An electron-volt is a unit of energy. But don’t think it’s some kind of super-powerful thing. It’s actually the smallest and most humble unit of energy physicists use because in the microscopic world, big numbers just make your brain hurt.

How does an electron-volt work?

Imagine you have a 1-volt battery. If an electron (a tiny and speedy guy) zips through the electric field of this battery, it gains an energy of 1 electron-volt. It’s like giving the electron a tiny kick and watching it speed off, thinking it’s the fastest thing in the universe.

How powerful is it, really?

Well… let’s just say:
That’s like asking an ant to pull a truck. The ant might try, but let’s face it: it’s not making a dent.

To lift a glass of water 1 meter high, you’d need about 10²⁰ eV. That’s like recruiting 100 billion billion electrons to team up and lift that glass. Teamwork makes the dream work😁

Why do physicists love electron-volts so much?🤤

In the atomic world, everything is tiny: electrons, nuclei, energies - everything except the physicists’ ambitions💅. If they used joules(I hope you know it, sometimes they write it on your chips pack) they’d be stuck writing numbers with a hundred zeros. But with electron-volts, it’s simple:

The energy of an electron in an atom? A few eV.

X-rays? Thousands of eV (kiloelectron-volts, keV).

Particles in an accelerator? Millions or billions of eV (MeV, GeV).

Cosmic rays? Trillions of eV (TeV).