Quantum Mechanics

What is the equation for the energy of the photon for particle theory?

• energy of photon = work function = maximum kinetic energy

• energy of photon * work function = maximum kinetic energy

• energy of photon = work function * maximum kinetic energy

• energy of photon = work function / maximum kinetic energy

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NGSS.HS-PS4-3

Light is both a(n) _____ and a wave.

• energy

• particle

• effect

• principle

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NGSS.HS-PS4-3

In Quantum Mechanics, the denser the electron cloud,

• the more likely the electron is to be found there

• the less likely the electron is to be found there

• the more likely the electron is to have a positive spin

• the less likely the electron is to have a positive spin

Quantum Mechanics says that electrons

• can act as both a particle and a wave

• can neither act as both a particle and a wave

• are a pure form of a wave only

• are particles only

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NGSS.HS-PS4-3

This is the most complete and current model of the atom. It consists of 61 elementary particles. Electrons are located in complex orbitals.

• The "Quantum Mechanical Model" of the atom

• The "Rutherford Model" of the atom

• The "Plum Pudding Model" of the atom

• The "Bohr Model" of the atom

This model of the atom is best associated with

• John Dalton

• Ernest Rutherford

• Niels Bohr

• Democritus

• Quantum Mechanics

Light and electrons are related because

• each can act as both a particle and a wave

• neither can act as both a particle and a wave

• each is a pure form of a wave only

• each are truly particles

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NGSS.HS-PS4-3

Which graph best shows the maximum kinetic energy K of the photoelectrons as a function of the frequency of incident light?

• A

• B

• C

• D

• E

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NGSS.HS-PS4-3

The graph shows the maximum kinetic energy of electrons released in the photoelectric effect as a function of the frequency of the incident light. This graph is often used as evidence of the particle nature of light. The graph supports which of the following statements? Select two answers.

• The number of photoelectrons increases as the frequency increases.

• There is a threshold frequency below which no photoemission occurs.

• The energy of photoelectrons depends on the energy of the incoming light.

• The intensity of the incoming light determines whether photoemission occurs.

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NGSS.HS-PS4-3

NGSS.HS-PS4-4

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-PS4-3