physics

Helen Margolis

Helen Margolis 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 Helen Margolis rather than just read about it. In short: Helen Sarah Margolis is a British physicist who is a Senior Fellow and Head of Science for Time and Frequency at the National Physical Laboratory. Her research considers the use of optical frequency metrology using femtosecond combs.

Key takeaways

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

Reference excerpt

Helen Sarah Margolis is a British physicist who is a Senior Fellow and Head of Science for Time and Frequency at the National Physical Laboratory. Her research considers the use of optical frequency metrology using femtosecond combs.

Early life and education Margolis studied physics at the University of Oxford. She completed her undergraduate and graduate training at Pembroke College, where she tested theories in quantum electrodynamics. In particular, she made use of electron beams to trap highly ionised atoms. After graduating, she remained at Oxford as a postdoctoral researcher, during which time she started working with the National Physical Laboratory.

Research and career Margolis joined the National Physical Laboratory in 1998. She developed femtosecond combs for optical frequency metrology. Her research looks to create highly accurate optical atomic clocks using trapped ions. She serves as coordinator of the European project Robust Optical Clocks for International Timescales (ROCIT). In this capacity, she seeks to make optical clocks more robust, such that they can run reliably, reproducibly and unattended for extended periods of time. In 2017, Margolis was made visiting professor at the University of Oxford. Working with Mark Walport, Margolis helped to draft the Blackett review, The Quantum Age: technological opportunities. She was appointed a Member of the British Empire in 2019 for her service to metrology.

Selected publications Margolis HS; Barwood GP; Huang G; Klein HA; Lea SN; Szymaniec K; Gill P (1 November 2004). "Hertz-level measurement of the optical clock frequency in a single 88Sr+ ion". Science. 306 (5700): 1355–1358. doi:10.1126/science.1105497. ISSN 0036-8075. PMID 15550666. Wikidata Q33209081. Rachel M. Godun; P B R Nisbet-Jones; J M Jones; et al. (17 November 2014). "Frequency ratio of two optical clock transitions in 171Yb+ and constraints on the time variation of fundamental constants". Physical Review Letters. 113 (21) 210801. arXiv:1407.0164. doi:10.1103/physrevlett.113.210801. ISSN 0031-9007. PMID 25479482. Wikidata Q55058766. P Delva; J Lodewyck; Sławomir Bilicki; et al. (2 June 2017). "Test of Special Relativity Using a Fiber Network of Optical Clocks". Physical Review Letters. 118 (22) 221102. arXiv:1703.04426. doi:10.1103/physrevlett.118.221102. ISSN 0031-9007. PMID 28621983. Wikidata Q50581635. Margolis HS; Gill P (21 August 2015) "Least-squares analysis of clock frequency comparison data to deduce optimized frequency and frequency ratio values" Metrologia 52 628. doi:10.1088/0026-1394/52/5/628

References

Worked examples

Example 1 — a first encounter with Helen Margolis

Start with the simplest possible case. Write down what Helen Margolis 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 Helen Margolis 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 Helen Margolis 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 Helen Margolis

In research: Helen Margolis 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 Helen Margolis 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: Helen Margolis is common in secondary-school and first-year university syllabi. It links to neighbouring topics Alumni of Pembroke College, Oxford, British physicists, British women physicists, so understanding it makes those chapters shorter.
In everyday life: Look for Helen Margolis 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 “Helen Margolis” →

Affiliate

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

How to study Helen Margolis in 20 minutes

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

Frequently asked questions

What is Helen Margolis in simple terms?

Why does Helen Margolis 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 Helen Margolis?

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 Helen Margolis.