A Particle Model of Waves

Front

Electromagnetic Radiation Noun

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[eh-lek-tro-mag-net-ik ray-dee-ay-shun]

Back

Electromagnetic Radiation

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A form of energy exhibiting wave-like behavior as it travels through space, composed of oscillating electric and magnetic fields.

Front

Emission Spectrum Noun

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[ee-mish-un spek-trum]

Back

Emission Spectrum

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A graph showing the intensity of radiation an object emits over a range of frequencies, which is dependent on temperature.

Front

Incandescence Noun

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[in-kan-des-ens]

Back

Incandescence

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The emission of visible light from a body as a result of its high temperature, causing it to glow.

Front

Quantized Adjective

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[kwon-tahyz'd]

Back

Quantized

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The property of a physical quantity, such as energy, existing only in discrete, specific amounts rather than a continuous range.

Front

Planck's Constant Noun

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[plahnks kon-stunt]

Back

Planck's Constant

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A fundamental physical constant that relates the energy of a single photon to its frequency, with a value of 6.63×10⁻³⁴ J·s.

Front

Photoelectric Effect Noun

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[foh-toh-ee-lek-trik ih-fekt]

Back

Photoelectric Effect

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The emission of electrons from a material when electromagnetic radiation of a sufficiently high frequency shines on it.

Front

Photocell Noun

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[foh-toh-sel]

Back

Photocell

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A device that uses the photoelectric effect to detect or measure light by converting light energy into an electrical current.

Front

Cathode Noun

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[kath-ohd]

Back

Cathode

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The negatively charged electrode in an electrical device, such as a photocell, from which electrons are emitted.

Front

Anode Noun

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[an-ohd]

Back

Anode

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The positively charged electrode in an electrical device, such as a photocell, which attracts and collects electrons.

Front

Threshold Frequency Noun

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[thresh-hohld free-kwen-see]

Back

Threshold Frequency

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The minimum frequency of incident radiation required to cause the photoelectric effect and eject an electron from a specific material.