physics

Peter Pershan

Peter Pershan 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 Peter Pershan rather than just read about it. In short: Peter S. Pershan is an American physicist.

Key takeaways

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

Reference excerpt

Peter S. Pershan is an American physicist.

Education and career Peter Pershan earned his B.S. at Polytechnic Institute of Brooklyn in 1956 and his Ph.D. in physics at Harvard University in 1960 for nuclear magnetic resonance under the supervision of Nicolaas Bloembergen. After a short postdoctoral appointment with Bloembergen he was appointed an assistant professor at Harvard University, where he was the Frank B. Baird, Jr. Professor of Science, at both Physics Department and Division of Engineering and Applied Sciences. He retired becoming emeritus in 2015.

Research Pershan began his career in nuclear magnetic resonance; however, before moving on to other things, he and Bloembergen produced some of the first papers on non-linear optics, a field for which Bloembergen later received Nobel Prize in Physics in 1981. He remained active in this field until the early 1980s when he wrote a book on liquid crystals and moved into the then-new field of synchrotron radiation. Along with Jens Als-Nielsen, Pershan developed the first synchrotron X-ray reflectometer for the study of the horizontal free surface of a liquid, and carried out the first synchrotron measurements on liquid surfaces at HASYLAB, DESY in 1982. The liquid surface spectrometers now at Advanced Photon Source and the National Synchrotron Light Source are all variations of the HASYLAB instrument. Since 1982 Pershan has led the field in exploration of such diverse liquid surfaces as superfluid helium, water, and liquid metals. Aside from sabbaticals at the University of Paris, Brookhaven National Laboratory, and Risø National Laboratory Pershan has been at Harvard University (where he has been a faculty member since 1961) since he arrived as a graduate student in September 1956.

Books In addition to over 240 scientific articles Peter Pershan has published three books:

"Structure of Liquid Crystal Phases", World Scientific, 1988 (ISBN 9971506688) "Liquid Surfaces and Interfaces: Synchrotron X-ray Methods" (with Mark Schlossman), Cambridge University Press, 2012. (ISBN 9780521814010) "Digital Photography Explained", World Scientific, 2023.(ISBN 9789811283420)

References

External links Peter Pershan's web page Peter Pershan @Harvard

Worked examples

Example 1 — a first encounter with Peter Pershan

Start with the simplest possible case. Write down what Peter Pershan 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 Peter Pershan 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 Peter Pershan 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 Peter Pershan

In research: Peter Pershan 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 Peter Pershan 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: Peter Pershan is common in secondary-school and first-year university syllabi. It links to neighbouring topics 21st-century American physicists, American nuclear physicists, Fellows of the American Physical Society, so understanding it makes those chapters shorter.
In everyday life: Look for Peter Pershan 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.

Ask Teacher Smith questions about this articleOpens your AI tutor with a question about “Peter Pershan” →

Affiliate

Preply — study more efficiently by working with a personal tutor. 50% off.

How to study Peter Pershan in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Peter Pershan 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 Peter Pershan out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Peter Pershan in simple terms?

Peter S. Pershan is an American physicist.

Why does Peter Pershan 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 Peter Pershan?

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 Peter Pershan.