Electrons and Light

What is emitted when an electron returns to its ground state?

• Photon (light)

• Electron (particle)

• Neutron (nuclear particle)

• Proton (nuclear particle)

What is the relationship between energy absorption and electron excitation?

• Electrons must absorb energy to move to an excited state.

• Electrons release energy to move to a ground state.

• Energy absorption has no effect on electron excitation.

• Electrons can move to an excited state without energy absorption.

What is the significance of bright lines in an emission spectrum?

• They indicate the presence of dark matter in the universe.

• They correspond to specific wavelengths of light emitted by electrons transitioning between energy levels.

• They represent the temperature of a star.

• They are caused by the absorption of light by molecules.

What is a spectroscope used for?

• To analyze the light emitted or absorbed by substances.

• To measure the temperature of stars.

• To determine the mass of celestial bodies.

• To observe the motion of planets.

What type of spectrum is produced when an element emits light?

• Absorption spectrum

• Continuous spectrum

• Emission spectrum

• Reflection spectrum

What is the role of energy in the behavior of electrons?

• Energy determines the state of electrons (ground or excited) and their transitions.

• Energy has no effect on electrons' behavior.

• Energy only affects the speed of electrons.

• Energy is irrelevant to electron transitions.

How can the identity of an unknown element be determined using its emission spectrum?

• By comparing the observed lines to known spectra of elements.

• By measuring the element's atomic mass.

• By analyzing the element's physical state at room temperature.

• By observing the element's reaction with water.

What can be inferred from the presence of specific lines in an emission spectrum?

• The presence of specific elements in the sample being analyzed.

• The temperature of the sample being analyzed.

• The pressure of the sample being analyzed.

• The color of the sample being analyzed.

What do emission spectra produce when viewed through a spectroscope?

• Dark lines

• Bright lines

• Continuous spectrum

• Faded colors

What must an electron do to change from ground state to an excited state?

• Release energy

• Absorb energy

• Remain in the same state

• Increase its mass