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 a 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

Photon

A

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

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6
Q

Threshold frequency (f0):

A

The minimum frequency of incident radiation at which electrons will

be emitted from a particular metal.

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7
Q

Work function of a metal (W0):

A

The minimum amount of energy needed to emit an electron from

the surface of a metal.

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8
Q

Red shift:

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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