Modern Physics 2

The photoelectric effect only occurs if the light shining on the metal is:

• coherent.
• above a minimum intensity.
• above a minimum frequency.
• above a minimum wavelength.

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The graph shows maximum kinetic energy of emitted electrons against frequency of incident light for a number of different metals.

Plank's constant is determined by:

• the x-intercept.

• the y-intercept.

• the slope

• the area under the graph.

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The graph shows maximum kinetic energy of emitted electrons against frequency of incident light for a number of different metals.
The threshold frequency is determined by:

• the x-intercept.
• the y-intercept.
• the gradient.
• the area under the graph.

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The photoelectric effect is when:

• Electrons collide inside a metal to release photons.
• One incident metal electron releases one photon.
• One incident photon releases one electron from a metal.
• Photons are absorbed in to metal ions releasing electrons.

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What must the minimum energy of photons falling ona copper plate be in order to observe the photoelectriceffect? (work function for copper 4.7 eV)

• 2.35 eV
• 1.175 eV
• 4.7 eV
• 9.4 eV

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Does high-frequency or low frequency light cause the ejection of a greater number of electrons from a metal surface?

• only high frequency
• only low frequency
• both of them
• doesn't depend to frequency

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Do the photons of violet light or the photons of red light, falling on a metal surface with the same intensity,cause emission of more electrons?

•  red light
• violet light
• same 

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Minimum frequency at which radiation causes the ejection of electrons from a metal

• stimulated emission
• photoelectric effect
• threshold frequency
• polarization

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The photoelectric effect helps us to understand

• the particle nature of light.
• diffraction pattern produced as light passes through a single slit.
• the wave behavior of light.
• spectroscopes.

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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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