Section 11 Light and Quantized Energy

Apuntes

Section 1: Light and Quantized Energy Light, a form of electromagnetic radiation, has characteristics of both a wave and a particle. K What I Know W What I Want to Find Out L What I Learned Essential Questions • How do the wave and particle natures of light compare? • How is a quantum of energy related to an energy change of matter? • How do continuous electromagnetic spectra and atomic emission spectra compare and contrast? Copyright © McGraw-Hill Education Light and Quantized Energy Vocabulary Review • radiation New • electromagnetic radiation • wavelength • frequency • amplitude • electromagnetic spectrum • quantum • Planck’s constant • photoelectric effect • photon • atomic emission spectrum Copyright © McGraw-Hill Education Light and Quantized Energy The Atom and Unanswered Questions • Recall that in Rutherford's model, the atom’s mass is concentrated in the nucleus and electrons move around it. • The model doesn’t explain how the electrons were arranged around the nucleus. • The model doesn’t explain why negatively charged electrons aren’t pulled into the positively charged nucleus. • In the early 1900s, scientists observed certain elements emitted visible light when heated i...