physics a level paper 1 cram

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11 Terms

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Beta minus decay

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Beta plus decay

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electron capture

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4 forces

EM

Gravity

Weak
Strong

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EM Exchange Particle

Virtual photon

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Gravity Exchange Particle

Graviton

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Weak

W boson

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Strong

Pion

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Emission spectra

  • Electron transitions from higher level to lower level so photon emitted

  • Each transition corresponds with wavelength and represented by line in spectrum

  • Discrete wavelengths

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Absorption spectra

  • When white light passes through cool, low pressure gas, certain wavelengths are missing

  • Continuous spectrum with dark lines at certain wavelengths

  • Dark lines correspond to differences in energy levels

  • photons emitted in all directions so some wavelengths appear to be missing

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