Light as an Electromagnetic Wave

Play an AI-generated podcast conversation about this lesson

Who proposed the first atomic theory that elements consist of indivisible atoms?

John Dalton

What did Democritus believe atoms were made of?

Tiny discrete particles

Which Greek philosopher did not believe in atomic theory and thought all elements were made of Earth, Fire, Water, and Air?

Aristotle

What did John Dalton propose about atoms of the same element?

Identical size, mass, and properties Signup and view all the answers

List three early scientists mentioned in the text who contributed to atomic theories.

Democritus, Aristotle, John Dalton Signup and view all the answers

What were some of the flaws in early scientific theories according to the text?

Not widely accepted models Signup and view all the answers

Who proposed that light was an electromagnetic wave with continuous wavelengths forming a spectrum?

James Maxwell Signup and view all the answers

What did Heinrich Hertz discover that linked matter and energy?

The photoelectric effect Signup and view all the answers

At what frequencies of light did Heinrich Hertz observe electrons being emitted from a metal surface?

Higher frequencies (blue-violet) Signup and view all the answers

What equation did Max Planck develop to describe the whole-number amount of energy gained or lost by matter?

$\Delta E = hf$ Signup and view all the answers

According to Max Planck, can matter absorb or emit any quantity of energy?

No Signup and view all the answers

What did Max Planck determine about the amount of energy matter could absorb or emit?

It reached a plateau before decreasing Signup and view all the answers

How does Rutherford's model describe the motion of the electron in an atom?

Accelerating in a circle Signup and view all the answers

Why does the electron lose energy as it travels in a circle in Rutherford's model?

Due to emitting photons Signup and view all the answers

What is the role of the nucleus in an atom according to Rutherford's model?

It is positively charged and pulls the electron closer Signup and view all the answers

What is spectroscopy, and how is it related to analyzing atomic spectra?

Spectroscopy is the analysis of light patterns to determine source properties. Signup and view all the answers

Why was the atomic spectrum of hydrogen significant in advancing atomic theory?

It provided key insights into atomic structure and behavior Signup and view all the answers

What is the term used to describe the patterns of visible light released by hydrogen atoms at various wavelengths?

Emission spectrum Signup and view all the answers

How can the absorption and emission spectra of radiation be visualized using a spectrophotometer?

Absorption: missing wavelengths, Emission: released wavelengths Signup and view all the answers

What type of spectrum does white light generate, and what does it contain?

Continuous spectrum, contains all wavelengths in visible light region Signup and view all the answers

What type of spectrum is generated when an excited atom returns to ground state?

Line spectrum, contains only certain wavelengths of the atom Signup and view all the answers

What did Niels Bohr use the emission spectrum to develop?

Quantum model of hydrogen Signup and view all the answers

Why are the unique line spectra of elements considered as 'fingerprints'?

Because each element has its own unique line spectrum Signup and view all the answers

Explain the concept of quantized energy in Bohr's model of the atom.

Electrons can only have specific amounts of energy at a time, moving in specific orbits with specific energy levels. Signup and view all the answers

What happens when electrons gain energy in Bohr's model?

Electrons can jump to a higher orbit further from the nucleus. Signup and view all the answers

Why do electrons release energy as visible light when they fall back to their original orbit?

Electrons release energy as visible light when falling back to their original orbit due to the conservation of energy. Signup and view all the answers

Which atoms did Bohr's model specifically apply to?

Bohr's model only applied to one-electron atoms like hydrogen. Signup and view all the answers

What does the Bohr equation determine in the context of hydrogen transitions?

The Bohr equation is used to determine the expected wavelength (color) of light emitted during a transition. Signup and view all the answers

Explain the significance of Louis De Broglie's further studies in relation to Bohr's model.

Further studies by Louis De Broglie were required to expand the model beyond one-electron atoms. Signup and view all the answers