physics

Pulsed energy projectile

Pulsed energy projectile is a physics topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Pulsed energy projectile rather than just read about it. In short: Pulsed energy projectile or PEP is a technology of non-lethal weaponry. The U.S. military is developing PEP using an invisible laser pulse which ablates the target's surface and creates a small amount of exploding plasma.

Key takeaways

Pulsed energy projectile belongs to physics; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Pulsed energy projectile to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Pulsed energy projectile from memory before moving on to harder problems.

Reference excerpt

Pulsed energy projectile or PEP is a technology of non-lethal weaponry. The U.S. military is developing PEP using an invisible laser pulse which ablates the target's surface and creates a small amount of exploding plasma. This produces a pressure wave that stuns the target and electromagnetic radiation that affects nerve cells causing a painful sensation. The technology can be used as a lethal weapon. The pulsed energy projectile is intended for riot control and is said to work over distances of up to 2 km. It weighs about 230 kg and can be mounted on vehicles. The US system was developed by Mission Research Corporation (now owned by Orbital ATK). It uses a chemical deuterium fluoride laser device producing infrared laser pulses. The plasma (produced by the early part of the pulse) explodes because its electrons absorb the energy of the later part of the pulse. In 2003, a US military review reported that the electromagnetic radiation produced by PEPs cause pain and temporary paralysis in animal experiments. The United States Special Operations Command FY 2010 plans included starting development on a Counter UAV Pulsed Energy Projectile.

Controversy PEP became controversial when it appeared that a team under Brian Cooper was assigned to work on the pain factor. It was discovered that PEP could with some tweaking induce cold burn feelings and other forms of painful sensations. The controversy and the fear of public opinion to see it turned into a torture tool that wouldn't leave any physical evidence on the victim ended the official program. Cooper kept on studying effects of laser-generated plasma pulse on pain receptors and published a paper in 2008 titled "Frequency Dependent Interaction of Ultrashort E-Fields with Nociceptor Membranes and Proteins".

Worked examples

Example 1 — a first encounter with Pulsed energy projectile

Start with the simplest possible case. Write down what Pulsed energy projectile claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In physics, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Pulsed energy projectile before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Pulsed energy projectile ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Pulsed energy projectile

In research: Pulsed energy projectile appears in physics research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Pulsed energy projectile in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Pulsed energy projectile is common in secondary-school and first-year university syllabi. It links to neighbouring topics Alliant Techsystems, Energy weapons, Non-lethal weapons, so understanding it makes those chapters shorter.
In everyday life: Look for Pulsed energy projectile outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Pulsed energy projectile in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Pulsed energy projectile means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Pulsed energy projectile out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Pulsed energy projectile in simple terms?

Why does Pulsed energy projectile matter?

Because it connects several physics ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Pulsed energy projectile?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Pulsed energy projectile.