Quantum & Nuclear Review

De Broglie equation

• relates the momentum of a mass to its wavelength

• relates the energy of a mass to its wavelength

• relates the frequency of a mass to its wavelength

• relates the work function of a mass to its wavelength

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Which of the statements below is true for the emission spectra

• The emission is only in the visible region

• The peak intensity increases with temperature

• The peak intensity decreases with temperature

• The peak frequency decreases with temperature

• The peak wavelength increases with temperature

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NGSS.HS-PS4-3

A black body in thermal equilibrium emits electromagnetic radiation. Which of the statements below are correct?

• The radiation has a specific spectrum and intensity

  that depends only on the temperature of the body

• Max Planck described the radiation by assuming that

  the electromagnetic radiation was emitted in discrete energies

• A black body is an idealized object which emits all

  frequencies

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A photon has a frequency of 4,3 x 10¹⁴ Hz, the energy of this photon is ___________ _J and the wavelength is ______nm

• 2.8 x 10^-19 and 7 x 10^-7

• 2.8 and 700

• 2.8 x 10^-19 and 700

• 2.8 and 7

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NGSS.HS-PS4-1

Quantum energy of Photon is

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What happens to the energy of a photon as the frequency of the wave increases? 

• The energy increases
• The energy decreases
• The energy stays the same 

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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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NGSS.HS-PS4-3

What is the best description of 'threshold frequency'?

• The minimum energy needed for electrons to escape a surface.

• The maximum kinetic energy that an emitted electron has.

• The minimum frequency of a photon that will cause an electron to be emitted.

• The frequency that an emitted electron will have.

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NGSS.HS-PS4-3

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The energy of the emitted electron is ------------

• hf

• h/f

• hf + W_o

• hf - W_o

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Use the graph to find the threshold frequency.

• −12×10^-19 Hz

• 0 Hz

• 2×10¹⁵ Hz

• 4×10¹⁵ Hz

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NGSS.HS-PS4-1

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