What are fundamental particles?

• Quarks

• Electrons

• Protons

• Neutrons

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This model was developed after J.J. Thompson discovered electrons, a particle smaller than an atom. Is shows electrons floating freely in a positive space.

• The "Plum Pudding Model" of the atom
• The "Rutherford Model" of the atom
• Democritus's model of the atom
• The "Solar System Model" of the atom

Proposed that the atom had a dense positively charge center which was extremely small but consisted of mostly empty space.

• Ernest Rutherford
• J.J Thomson
• Robert Millikan
• John Dalton

During the thin foil experiment, it was seen that a______of alpha particles passed through the thin foil because the atom__________.

• majority; was dense
• few; was mostly empty space
• majority; was mostly empty space
• few; was dense

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All atoms consist of mostly empty space.

• True
• False

Rank the four fundamental forces of nature in order from weakest to strongest:  

• Electromagnetism, Gravity, Strong Nuclear, Weak Nuclear
• Weak Nuclear, Gravity, Electromagnetism, Strong Nuclear
• Gravity, Weak Nuclear,  Electromagnetism, Strong Nuclear
• Weak Nuclear, Electromagnetism, Gravity, Strong Nuclear

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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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The photoelectric experiment is where

• two atoms are forced to collide.
• you look through diffraction glasses to see the emission spectrum of light.
• light is shined on a piece of metal and electrons are ejected.
• two atoms are split.

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The emission spectrum is produced when

• electrons release energy as they move to their excited state.

• electrons absorb energy as they move to their excited state.

• electrons release energy as they return to the ground state.

• electrons absorb energy as they return to the ground state.

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A characteristic set of light wavelengths absorbed by a material.

• hydrogen spectra
• absorption spectrum
• electromagnetic spectrum
• emission spectrum

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