Energy of a Photon

The energy of an emitted photon can be calculated from ...

• Plancks constant x frequency of the photon

• h x c / wavelength of the light emitted

• the difference in the energy levels

• all of the above

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Photoelectrons will be ejected from a material surface if?

• The threshold frequency is greater than the photon frequency

• The work function is less than the photon energy

• The intensity of light is high enough

• The wavelength of photon is maximum

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NGSS.HS-PS4-3

A monochromatic light beam with a quantum energy of 9.0 eV is incident upon a photocell. The work function of the photocell is 4.1 eV. What is the maximum kinetic energy of the electron.

• 4.2 eV

• 4.4 eV

• 4.7 eV

• 4.9 eV

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In an experiment, photoelectric effect is observed in metal A when light with frequency (f ) falls on the metal. If the light frequency used in this experiment is doubled, the photoelectrons

• Will not be ejected

• Will be ejected as observed in the previous

• Will be ejected with greater number of photoelectrons

• Will be ejected with greater kinetic energy

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A metal surface is struck with light of λ = 400 nm, releasing a stream of electrons. If the 400 nm light is replaced by λ= 300 nm light of the same intensity, what is the result?

• More electrons are emitted in a given time interval

• Fewer electrons are emitted in a given time interval

• Emitted electrons are more energetic

• Emitted electrons are less energetic

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Planck's constant can be found ...

• energy of a particle x speed of light / wavelength

• energy of a particle x speed of light / frequency of light

• energy of a particle x wavelength / speed of light

• slope of the cut-off voltage vs frequency graph

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When light of specific frequencies is shined on a surface, electrons are ejected from the surface. This is the idea behind...

• Quantization of Energy

• Photoelectric Effect

• Compton Effect

• deBroglie Waves

• Uncertainty Principle

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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 minimum frequency for which the photoelectric effect can occur is called the

• absolute frequency

• cut off frequency

• Lyman frequency

• threshold frequency

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What is the equation for Planck's Law?

• Energy of a photon = Planck's constant * frequency of light

• Energy of a photon = Planck's constant / frequency of light

• Energy of a photon * Planck's constant = frequency of light

• Energy of a photon = Planck's constant = frequency of light

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