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Chem Chap 4 - Sec 1

The Development of a New Atomic Model

A form of energy that exhibits wavelike behavior as it travels through space. electromagnetic radiation
All of the frequencies or wavelengths of electromagnetic radiation electromagnetic spectrum
All forms of electromagnetic radiation move at a constant speed of 3.00 x 10 to the 8th power m/s through a vacuum and a slightl slower speed through matter
The distance between corresponding points on adjacent waves Wavelength
What is the significant feature of wave motion repetitive nature
The number of waves that pass a given point in a specific time usually one second Frequency
How is frerquency expressed waves/second
What is one wave/second called hertz
A pioneer in the study of elecromagnetic radiation. Heimrich Hertz
How can you measure a waves frequency Observing how often the water level rises and falls at a given point
What is the formula for electormagnetic radiation c=&v
In the electromagnetic radiation formula what does c The speed of light
In the electromagnetic radiation formula what does & The wavelength of the electomagnetic wave
In the electromagnetic radiation formula what does v Frequency of the electromagnetic wave
Because c is the same for all electromagnetic radiation, the product &v is a constant
As the wavelength of light decreases, its frequency increases
the emission of electrons from a metal when light shines on the metal photoelectric effect
electromagnetic radiation strikes the surface of the metal,ejecting electrons from the metal and causing an electric current. photoelectric effect
Who suggested that the object emits energy in small, specific packets Planck
the minimum quantity of energy that can be lost or gained by an atom quantum of energy
Small specific packets of energy Quanta
What does the equation E = hv represent The relationship between a quantum of energy and the frequency of radiation.
In the Equation E = hv, what does E represent Energy
In the Equation E = hv, what does v represent frequency
In the Equation E = hv, what does h represent fundamental physical constant known as Planck's constant
a particle of electromagnetic radiation having zero mass and carrying a quantum of energy photon
How did Einstein explain the photoeletric effect He proposed that electromagnetic radiation is absorbed by matter only in whole numbers of photons.
What has to occur for an electron to be ejected froma metal surface the electron must be struck by a single photon possessing at least the minimum energy required to knock the electron loose
The lowest energy state of an atom is ground state
A state in which an atom has a higher potential energy than it has in its ground state excited state.
When an excited atom returns to its ground state or a lower energy excited state, it gives off the energy it gained in the form of electromagnetic radiation
When a narrow beam of the emitted light was shined through a prism, it was separated into four specific colors of the visible spectrum known as emission-line spectrum
The wavelengths of some of the spectral series are known as Lyman, Balmer, and Paschen series, after their discoverers
the emission of a continuous range of frequencies of electromagnetic radiation continuous spectrum
Attempts to explain the observation of why hydrogen atoms gave off only specific frequencies of light led to what theory quantum theory
Whenever an excited hydrogen atom falls to its ground state or to a lower-energy excited state, it emits what photon of radiation
When the electron falls to a lower energy level, a photon is emitted,the process is called emission.
When Energy must be added to an atom in order to move an electron from a lower energy level to a higher energy level. This process is called absorption.
The electron can circle the nucleus only in allowed paths or Orbits
Created by: tbstinso



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