physics

Vadim Lashkaryov

Vadim Lashkaryov 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 Vadim Lashkaryov rather than just read about it. In short: Vadim Evgenievich Lashkaryov (October 7, 1903 – December 1, 1974) was a Soviet experimental physicist. He was an academician of the National Academy of Sciences of Ukraine and is known for his fundamental contributions to physics of semiconductors.

Key takeaways

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

Reference excerpt

Vadim Evgenievich Lashkaryov (October 7, 1903 – December 1, 1974) was a Soviet experimental physicist. He was an academician of the National Academy of Sciences of Ukraine and is known for his fundamental contributions to physics of semiconductors.

Life He was born in Kyiv, to a family of a lawyer.

Career Lashkaryov graduated from the Kyiv Institute for People Education (as the Kyiv University was termed at that time) in 1924. He started his research work on the diffraction of X-rays in the Kyiv Polytechnic Institute and continued it in the newly established Institute of Physics of the Ukrainian Academy of Sciences. In 1928 he moved to Physical-Technical Institute in Leningrad (currently Ioffe Institute in Saint Petersburg), where he performed first in the Soviet Union experiments on electron diffraction. After a forced stay in Arkhangelsk, where he taught physics in the local Medical Institute, Lashkaryov returned to Kyiv in 1939, where he switched to physics of semiconductors. In 1941 Lashkaryouv published his fundamental discovery, the presence of a semiconductor layer between the barrier layer and the adjacent electrode, and the opposite sign of charge carriers (electrons and holes) on both sides of a barrier layer in solar cells of Cu2O and silver sulphide photocells and selenium rectifiers. In current terms, this was a discovery of p–n junctions around the rectifying layers in these systems. This discovery was made by measuring the sign change of thermo-e.m.f. on both sides of the rectifying layer by using miniature thermoprobes. During World War II, Lashkaryov worked in the city of Ufa on cuprous-oxide devices for defense needs. After World War II, back in Kyiv, Lashkaryov investigated bipolar diffusion of photo-carriers in cuprous oxide, photoconductivity of CdS and CdSe, and also on Ge diodes and transistors. In 1960, Lashkaryov founded in Kyiv the Institute of Semiconductors of the Ukrainian Academy of Sciences that currently carries his name. He also established a Chair in semiconductor physics in the Taras Shevchenko National University of Kyiv.

Worked examples

Example 1 — a first encounter with Vadim Lashkaryov

Start with the simplest possible case. Write down what Vadim Lashkaryov 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 Vadim Lashkaryov 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 Vadim Lashkaryov 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 Vadim Lashkaryov

In research: Vadim Lashkaryov 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 Vadim Lashkaryov 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: Vadim Lashkaryov is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1903 births, 1974 deaths, 20th-century Ukrainian physicists, so understanding it makes those chapters shorter.
In everyday life: Look for Vadim Lashkaryov 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 Vadim Lashkaryov in 20 minutes

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

Frequently asked questions

What is Vadim Lashkaryov in simple terms?

Why does Vadim Lashkaryov 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 Vadim Lashkaryov?

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 Vadim Lashkaryov.