Photoelectric & Electrochem Quiz

What is the formula to calculate the energy of a photon?

• E = mc^2

• E = hf

• E = 1/2 mv^2

• E = kq1q2/r

Define work function in the context of the photoelectric effect.

• The work function is the maximum energy of an electron in a material.

• The work function in the context of the photoelectric effect is the minimum amount of energy required to eject an electron from the surface of a material.

• Work function is the energy released when an electron is ejected from a material.

• Work function is the speed of electrons ejected from a material.

Explain the process of the photoelectric effect experiment.

• Measuring the emitted protons' kinetic energy instead of electrons

• Using sound waves instead of light for excitation

• Selecting a glass plate instead of a metal plate

• The process of the photoelectric effect experiment involves selecting a metal plate, exposing it to light of varying frequencies, measuring the emitted electrons' kinetic energy, and analyzing the results to determine the relationship between light frequency and electron emission.

What is the purpose of an electrochemical cell?

• To produce mechanical energy

• To store light energy

• To generate heat energy

• To convert chemical energy into electrical energy

Describe the concept of redox reactions in electrochemistry.

• Redox reactions do not involve electron transfer.

• Redox reactions involve only the gain of electrons.

• Redox reactions in electrochemistry involve electron transfer where oxidation is the loss of electrons and reduction is the gain of electrons.

• Oxidation is the gain of electrons and reduction is the loss of electrons.

How is the Nernst equation used in electrochemistry?

• The Nernst equation is used to predict the color changes of compounds in electrochemistry.

• The Nernst equation is used to calculate the cell potential under non-standard conditions by relating it to the concentrations of reactants and products in the cell.

• The Nernst equation is used to determine the rate of reaction in electrochemistry.

• The Nernst equation is used to calculate the atomic weight of elements in electrochemistry.

What is the relationship between photon energy and frequency?

• Photon energy is proportional to wavelength, not frequency.

• Photon energy is not related to frequency.

• Photon energy is inversely proportional to frequency.

• Photon energy is directly proportional to frequency.

How does the work function affect the photoelectric effect?

• The work function affects the photoelectric effect by determining the energy threshold required to release electrons from a material.

• The work function decreases the number of photons hitting the material

• The work function increases the speed of light in the material

• The work function has no impact on the photoelectric effect

What are the key components of an electrochemical cell?

• External Circuit, Anode, Cathode, Insulator

• Cathode, Anode, Insulator, Internal Circuit

• Anode, Cathode, Electrolyte, External Circuit

• Electrolyte, Anode, Cathode, Insulator

How do oxidation and reduction reactions occur in electrochemistry?

• Oxidation occurs in the solution, reduction occurs in the solid electrode.

• Oxidation occurs at the cathode, reduction occurs at the anode.

• Oxidation and reduction occur at the same electrode.

• Oxidation occurs at the anode, reduction occurs at the cathode.