3.12 Photoelectric Effect

What happens to the energy of an atom or molecule when a photon is absorbed or emitted by it?

Increased or decreased

By how much does the energy of an atom or molecule increase or decrease when a photon is absorbed or emitted by it?

Same energy as the photon

When does the energy of an atom or molecule increase or decrease?

When a photon is absorbed or emitted by it

What happens to a sample in spectroscopy?

Exposed to a source of electromagnetic radiation

What does the radiation do to the sample during spectroscopy?

Affects it

What does the effect of the radiation on the sample during spectroscopy involve?

Absorption and emission of energy

How are changes in energy processed in spectroscopy?

Through a detector

What does the detector process in spectroscopy?

Changes in energy

What does a detector produce during spectroscopy?

Spectrum

What can the energy absorbed or emitted from a sample be described in terms of?

Photons

A particle of radiation that has a specific wavelength, frequency, and energy

Photon

What are the units of wavelength usually expressed in units of?

Meters

What is a common unit of wavelength other than meters?

Nanometers

How many nanometers are in one meter?

10^9

What units is frequency usually expressed in?

Hz or s^-1

What’s the difference between Hz and s^-1?

No difference

What is energy usually expressed in?

J or kJ

What does J stand for?

Joules

What does kJ stand for?

Kilojoules