20. Atoms and Photoelectric Effect

20. Atoms and Photoelectric Effect

By Victoria Vercammen

Multiple Choice

Which scientist proposed a new model of the atom after the discovery of the electron in 1897? His model consisted of electrons embedded in a sea of positive charge like seeds in a watermelon.

• J.J. Thomson

• Ernest Rutherford

• Niels Bohr

• Albert Einstein

Multiple Choice

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
• Quantum Mechanic's model of the atom

• The "Solar System Model" of the atom

Multiple Choice

This model added on to previous models by showing electrons existed at certain "energy levels". However is does not accurately show what those levels look like.

• Bohr's Model

• Rutherford's Model

• Thompson's Model

• Quantum Mechanics' Model

Multiple Choice

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

Multiple Choice

During Rutherford's 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

Multiple Choice

True or False:

According to quantum mechanics, we can't exactly tell where an electron is located, we can only predict where it's usually found the most

• True

• False

Multiple Choice

The majority of an atom's mass exists where?

• In the nucleus
• In the electron cloud
• In the space between the nucleus and the electrons
• In the neutrons

Multiple Choice

What does the nucleus of an atom contain?

• Electrons and neutrons
• Protons and neutrons
• Neutrinos and positrons
• DNA and RNA

Multiple Choice

According to today's model, how are electrons arranged?

• In groups of five
• In energy levels
• By color
• By shape

Multiple Choice

All atoms consist of mostly empty space.

• True
• False

Multiple Choice

A particle of light is called a...

• Photoelectron

• Photon

• Proton

• Electron

Multiple Choice

This image is an illustration of

• photoelectric effect
• Dalton's atomic theory
• Bohr model
• Quantum mechanical model

Multiple Choice

What is the best description of 'threshold frequency'?

• The minimum energy needed for electrons to escape a surface.

• The maximum kinetic energy that an emitted electron has.

• The minimum frequency of a photon that will cause an electron to be emitted.

• The frequency that an emitted electron will have.

Multiple Choice

The only way to increase the number of photoelectrons emitted is by increasing the _________ of the light

• Intensity

• Wavelength

• Frequency

• Energy

Multiple Choice

Photoelectric effect provides the evidence for the ______ nature of radiation.

• dual

• wave

• particle

• electromagnetic

Multiple Choice

The wave-particle duality of light describes light as...

• a wave only
• a particle only
• both a wave and a particle
• neither a wave nor a particle