Photons and electrons Flashcards

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1
Q

Frequency

A

The number of complete waves that pass a point per second. Frequency is measured in hertz (Hz).

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2
Q

Wavelength

A

The distance between two consecutive points on a wave that are in phase. Wavelength is measured in metres.

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3
Q

The photoelectric effect

A

The process that occurs when light shines on metal and electrons are ejected.

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4
Q

Significance of the photoelectric effect

A

It establishes the quantum theory and it illustrates the particle nature of light.

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5
Q

A photon

A

The quantum of energy when the energy is in the form of electromagnetic radiation.

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6
Q

Threshold frequency

A

The minimum frequency of incident radiation at which electrons will be emitted from a particular metal.

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7
Q

The work function of a metal

A

The minimum amount of energy needed to emit an electron from the surface of a metal.

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8
Q

Redshift

A

A shift in the spectra of distant galaxies toward longer wavelengths, i.e. towards the red end of the spectrum.

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9
Q

An absorption spectrum

A

Produced when white light from a source passes through a “cool” gas. It is also referred to as a line absorption spectrum.

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10
Q

An emission spectrum

A

Produced when electrons “fall” from an orbital of higher energy to an orbital of lower energy. It is also referred to as a line emission spectrum.

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