physics

Njål Hole

Njål Hole 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 Njål Hole rather than just read about it. In short: Njål Hole (15 November 1914 – 6 February 1988) was a Norwegian chemical engineer and nuclear physicist. His research was primarily in the field of nuclear physics.

Key takeaways

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

Reference excerpt

Njål Hole (15 November 1914 – 6 February 1988) was a Norwegian chemical engineer and nuclear physicist. His research was primarily in the field of nuclear physics.

Biography He was born in Hjørundfjord Municipality. He graduated from the Norwegian Institute of Technology in 1938. From 1938 he was an assistant at Norwegian Institute of Technology. During the German occupation of Norway, he participated in resistance activities, and had to flee to Sweden. In Stockholm he was appointed at the same laboratory as exiled Austrian nuclear physicist Lise Meitner, who had been part of the team that discovered nuclear fission. Hole had contacts with the British Secret Intelligence Service, reporting to Norwegian intelligence officer Leif Tronstad (1903–1945) in London. He was decorated Member of the Order of the British Empire after the war. He was appointed professor in physics at the Norwegian Institute of Technology in Trondheim from 1947 and took his doctorate in 1950. In 1954 he became professor of experimental physics. In 1964, he took over a new professorship in general physics, which he managed until his retirement in 1981.

References

Related reading Dahl, Per F. (1999). Heavy Water and the Wartime Race for Nuclear Energy. London: Taylor & Francis. ISBN 9780750306331.

Illustrations

Worked examples

Example 1 — a first encounter with Njål Hole

Start with the simplest possible case. Write down what Njål Hole 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 Njål Hole 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 Njål Hole 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 Njål Hole

In research: Njål Hole 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 Njål Hole 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: Njål Hole is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1914 births, 1988 deaths, 20th-century Norwegian engineers, so understanding it makes those chapters shorter.
In everyday life: Look for Njål Hole 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 Njål Hole in 20 minutes

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

Frequently asked questions

What is Njål Hole in simple terms?

Njål Hole (15 November 1914 – 6 February 1988) was a Norwegian chemical engineer and nuclear physicist. His research was primarily in the field of nuclear physics.

Why does Njål Hole 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 Njål Hole?

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 Njål Hole.