Quantum Mechanics

Why don't we notice matter acting like waves in everyday life?

• their de Broglie wavelengths are too large to notice

• their de Broglie wavelengths are too small to notice

• matter is not a wave

• matter is made of particles

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NGSS.HS-PS4-3

In a Bohr model of the atom, the further an electron is away from the nucleus

• the more likely it will fly off into oblivion

• the lower its energy level

• the higher its energy level

• the less likely it will be a bonding electron

In a Bohr model of the atom, the closer an electron is to the nucleus

• the more likely it will be sucked into the nucleus forever

• the lower its energy level

• the higher its energy level

• the more likely it will be a bonding electron

When an electron emits light

• the electron gets "excited" and "jumps out" away from the nucleus

• the electron gets "excited" and "drops back down" closer to the nucleus

• the electron "calms down" and "jumps out" away from the nucleus

• the electron "calms down" and "drops back down" closer to the nucleus

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NGSS.HS-PS4-3

What is weak nuclear interaction?

• One the four fundamental interactions; a combination of electricity and magnetism.

• One the four fundamental interactions; responsible for bringing objects towards each other. It is the only force known to interact with time, and it is not fully explained by the Standard Model.

• One the four fundamental interactions; responsible for the radioactive decay of massive particles.

• One the four fundamental interactions; caused by color-charged particles.

What is a gluon?

• 6.62607004 × 10^-34

• The force-carrier particle for the strong nuclear interaction.

• The force-carrier particles for the weak nuclear interaction.

• A particle that obeys Pauli's Exclusion Principle.

In an experiment, light of a particular wavelength is incident on a metal surface, and electrons are emitted from the surface as a result. To produce more electrons per unit time but with less kinetic energy per electron, the experimenter should do which of the following?

• Increase the intensity and decrease the wavelength of the light.

• Increase the intensity and the wavelength of the light.

• Decrease the intensity and the wavelength of the light.

• Decrease the intensity and increase the wavelength of the light.

• None of the above would produce the desired result.

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NGSS.HS-PS4-3

The diagram shows a circuit involving a photoelectric cell. When UV light is shone onto the metal cathode, electrons are emitted establishing a photocurrent.
Which of the following changes could cause the photocurrent to stop?

• Increasing the potential difference of the power supply.

• Increasing the frequency of the UV light.

• Increasing the intensity of the UV light.

• Changing the metal surface to one with a smaller work function.

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NGSS.HS-PS4-3

What is the energy of a photon with a frequency of 5x10¹⁴ Hz? (you need to do calculation. You have enough time)

• 2.5x10^-19 J

• 3.0x10^-19 J

• 3.3x10^-19 J

• 4.5x10^-19 J

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NGSS.HS-PS4-1

This model added on to previous models by showing electrons existed at certain "energy levels". It is often called the Planetary Model.

• The "Bohr Model" of the atom

• The "Rutherford Model" of the atom

• The "Plumb Pudding Model" of the atom

• The "Quantum Mechanical Model" of the atom

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