Flashcards
Chem Exam 3
Cards in this deck (18)
- 1What does classical physics say about matter and energy?Matter/Energy are distinct
- 2What were Einstein's discoveries of the Quantum Theory?Worked with photoelectric effect, as photons of light hit the metal, the photons need a certain amonut of energy to eject electrons, does not depend on intensity
- 3What were Planck's discoveries of the Quantum Theory?The ultraviolet catastrophe in blackbody radiation occured because energy could only be absorbed in distinct frequencies or "packets" of energy known as quanta
- 4What is the atomic spectra? Who came up with it?Rutherford (nucleus center of atom), electron at ground state, when energy is added it is at an excited state, and as it releases energy light is produced
- 5What were problems with the photoelectric effect?As the wavelength of light decreased, no electrons came off; Increase the intensity of light and nothing happened
- 6Describe the photoelectric effectShine light on a piece of metal and electrons are shot off in different directions
- 7Describe the ultraviolet catastropheas wavelength of light gets shorter, intensity of blackbody radiation should increase to infinity, instead it did the opposite
- 8What is Blackbody radiation?Ideal black body (chunk of matter) will absorb all electromagnetic radiation and emit that energy perfectly as blackbody radiation
- 9How do matter and energy exist?matter exists as particles (mass) and energy exists as waves (no mass)
- 10What is the quantum theory?A theory that was developed to help explain the behavior of atoms and light
- 11Speed and frequency are...inversely proportional to each other, c=wavelength x v
- 12What is the speed constant?3.0 E 8 m/sec
- 13What letter denotes speed?c
- 14What are the units of Hz?Cycles per second
- 15What is frequency?Number of waves that pass a given point in a certain amount of time, measured in hertz, Hz
- 16What is a wavelength? What units is it measured in?From crest to crest of a wave, measured in meters
- 17How are waves measured?According to wavelength, frequency, and speed
- 18What is electromagnetic radiation?How light energy travels in the universe
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- Flashcards on Chem Exam 3, created by Tianna Crew on 09/04/2013.
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- Tianna Crew
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