a chemical element that is a heavy, radioactive metal, used in the production of nuclear power

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Uncertainty principle

ʌnˈsɜː.tən.ti ˈprɪnsəpl

Notion that postulates, it is physically impossible to measure simultaneously the exact position and the exact linear momentum of a particle

Uncertainty principle was introduced by Werner Heisenberg in 1927

Принцип неопределенности

UNIT 28

Spectrum (pl. spectra), n

ˈspektrəm

When the emitted light is analyzed with a spectrometer, discrete bright lines are observed, each having a different wavelength, or color. Such a series of spectral lines is commonly called an emission spectrum.

The wavelengths contained in such a spectrum are characteristic of the element emitting the light

Спектр (спектры)

Nucleus (pl. nuclei), n

ˈnjuːklɪəs

positive charge in an atom was concentrated in a region that was small relative to the size of the atom

the electron can be found in a spherical region surrounding the nucleus.

Ядро (ядра)

Bohr radius, n

Bɔːr ˈreɪdɪəs

Bohr radius is a physical constant, equal to the most probable distance between the nucleus and the electron in a hydrogen atom

the electron can exist only in certain allowed orbits determined by the integer n. The orbit with the smallest radius, called the Bohr radius, corresponds to n = 1

Боровский радиус

Excited state, n

ɪkˈsaɪtɪd steɪt

some atoms are raised to various allowed higher energy levels, called excited states

there are many more atoms in the ground state than in excited states

Возбужденное состояние (энергетический уровень)

Transistor, n

tranˈzɪstə

a semiconductor device with three connections, capable of amplification in addition to rectification.

the transistor had replaced the vacuum tube in many electronic applications

Транзистор

Diode, n

ˈdaɪəʊd

an electrical component that allows the flow of current in only one direction.

we apply our knowledge of atomic structure to describe the mechanisms involved in the behavior of solid-state devices such as diodes and transistors.

Диод

UNIT 29

Uranium, n

/jʊəˈreɪ.ni.əm

At least we know the Russians have the uranium.

Уран

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