physics

R. E. Siday

R. E. Siday 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 R. E. Siday rather than just read about it. In short: Raymond Eldred Siday (1912–1956) was an English mathematician specialising in quantum mechanics. He obtained his BSc in Special Physics and later worked at the University of Edinburgh.

Key takeaways

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

Reference excerpt

Raymond Eldred Siday (1912–1956) was an English mathematician specialising in quantum mechanics. He obtained his BSc in Special Physics and later worked at the University of Edinburgh. He began collaborating with Werner Ehrenberg in 1933. Raymond Siday is known for the Ehrenberg–Siday effect.

Family He was the brother of Eric Siday, a pioneer of electronic music and amateur racing driver

Ehrenberg–Siday–Aharonov–Bohm effect

The Ehrenberg–Siday effect, later known as the Aharonov–Bohm effect, is a quantum mechanical phenomenon by which a charged particle is affected by electromagnetic fields in regions from which the particle is excluded. The earliest form of this effect was predicted by Ehrenberg and Siday in 1949, and similar effects were later rediscovered by Aharonov and Bohm in 1959. Such effects are predicted to arise from both magnetic fields and electric fields, but the magnetic version has been easier to observe. In general, the consequence of Aharonov–Bohm effects is that knowledge of the classical electromagnetic field acting locally on a particle is not sufficient to predict its quantum-mechanical behavior.

Selected papers Siday, R.E. (1942). "The determination of the optical properties of thick magnetic lenses, and the application of these lenses to beta-ray spectrometry". Proc. Phys. Soc. 54 (3): 266–277. Bibcode:1942PPS....54..266S. doi:10.1088/0959-5309/54/3/305. Siday, R.E. (1947). "The optical properties of axially symmetric magnetic prisms part 1: The study of rays in a plane of symmetry, and its application to the design of prism β-spectroscopes". Proc. Phys. Soc. 59 (6): 905–917. Bibcode:1947PPS....59..905S. doi:10.1088/0959-5309/59/6/301. Siday, R.E. (1947). "The Optical Properties of Axially Symmetric Magnetic Prisms". Proc. Phys. Soc. 59 (6): 1036–1036. Bibcode:1947PPS....59Q1036.. doi:10.1088/0959-5309/59/6/415. Ehrenberg, W.; Siday, R. E. (1949). "The Refractive Index in Electron Optics and the Principles of Dynamics". Proc. Phys. Soc. B62 (1): 8–21. Bibcode:1949PPSB...62....8E. CiteSeerX 10.1.1.205.6343. doi:10.1088/0370-1301/62/1/303. {{cite journal}}: Cite uses deprecated parameter |citeseerx= (help)

References

Worked examples

Example 1 — a first encounter with R. E. Siday

Start with the simplest possible case. Write down what R. E. Siday 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 R. E. Siday 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 R. E. Siday 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 R. E. Siday

In research: R. E. Siday 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 R. E. Siday 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: R. E. Siday is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1912 births, 1956 deaths, 20th-century British physicists, so understanding it makes those chapters shorter.
In everyday life: Look for R. E. Siday 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 R. E. Siday in 20 minutes

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

Frequently asked questions

What is R. E. Siday in simple terms?

Raymond Eldred Siday (1912–1956) was an English mathematician specialising in quantum mechanics. He obtained his BSc in Special Physics and later worked at the University of Edinburgh.

Why does R. E. Siday 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 R. E. Siday?

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 R. E. Siday.