Modern Physics

A particle of light is called a...

• Photoelectron

• Photon

• Proton

• Electron

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The energy of photoelectrons emitted from a metal surface can be increased by

• using light of higher frequency.

• using light of longer wavelength.

• using light of higher intensity.

• using monochromatic, polarized light.

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This image is an illustration of

• photoelectric effect

• Dalton's atomic theory

• Bohr model

• Quantum mechanical model

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What is the energy, in eV, of a photon that has a wavelength of 620 nm?

• 1eV

• 2eV

• 3eV

• 4eV

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The quantum mechanics or wave mechanics model, which described the atom using a three dimensional system of waves, was developed by.

• Max Planck

• Albert Einstein

• Erwin Schrodinger

• Louis de Broglie

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Who published a theory explaining the photoelectric effect in 1905?

• Niels Bohr

• Albert Einstein

• Isaac Newton

• Max Planck

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What event in 1938 significantly impacted the scientific community and contributed to the development of nuclear weapons?

• The discovery of nuclear fusion.

• The invasion of Poland by Germany.

• The realization of the destructive potential of nuclear fission.

• The signing of a peace treaty in Europe.

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Find the energy, in joules per photon, of microwave radiation with a frequency of 7.91 × 10 ¹⁰ 1/s.

• 6.63 x 10^-34 J

• 5.25 x 10¹⁴ J

• 5.24 x 10^-23 J

• 1.19 x 10⁴⁴ J

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Whose model is based on the Uncertainty Principle?

• Schrodinger / Heisenberg

• Bohr

• Rutherford

• Thomson

What is the mass of an antineutron in kilograms?

• -1.67 x 10 ^-27 kg

• 1.67 x 10 ^-27 kg

• +1 u

• -1 u