Chemistry Chapter 6
SI units for the frequency of light
1/second (s^-1)
kilohertz can be written as
10^3 /s
Megahertz can be written as
10^6 /s
Planck's Constant
6.626 x 10^-34 (J-s)
Continuous spectrum
A rainbow of colors which has the light of all the wavelengths.
Line spectrum
A spectrum that contains radiation of only specific wavelengths
Quantum
Amount of energy that can be emitted or absorbed
Matter waves
Describes the wave characteristics of a particle
Equation for the energy of a proton
E= h(Planck's law) v(frequency)
Equation to find E
E=h(Planck's Law)v(frequency)
Who tried to use the Planck's quantum theory to explain the photoelectric effect?
Einstien
What was Planck's original theory?
Energy can only be released or absorbed in discreet amounts (quanta) with certain minimum size.
Electromagnetic radiation is incapable of passing through water.
False
The frequency of radiation increases as the wavelength increases.
False
The glow from a fireplace, the energy within a microwave oven, and a foghorn blast are all forms of electromagnetic radiation.
False
Ultraviolet light has longer wavelengths than visible light.
False
_____ and ______ are inversely proportional to each other.
Frequency, wavelength
What does it mean when we say energy is quantized?
It can only be released in specific amounts.
Frequency
Number of complete wavelengths or cycles that pass a given point each second
What kind of photons can be absorbed or emitted as the electron changes energy state?
Ones of specific allowed frequencies
Bohr's First Postulate
Only orbits of certain radii, corresponding to certain definite energies, are permitted for the electron in a hydrogen atom.
Uncertainty principle
The position and momentum of a particle cannot be simultaneously measured with high precision.
All moving objects produce matter waves.
True
Electromagnetic radiation and sound waves travel at the same speed.
True
Electromagnetic radiation travels through a vacuum at a constant speed, regardless of wavelength.
True
Infrared light has higher frequencies than visible light.
True
Visible light is a form of electromagnetic radiation.
True
nm is the common wavelength unit for ______ and _____ radiation.
Ultraviolet and visible
Arrange the following kinds of electromagnetic radiation in order of increasing wavelength:infrared, green light, red light, radio wave, X-rays, ultraviolet light.
Wavelength of X-ray, ultraviolet, green light, red light, infrared, radio ways.
Wavelength
distance between two adjacent crests of a wave
Electromagnetic radiation
energy waves that travel in a vacuum at a speed of 2.998x10^8 m/s
If the wavelength is long there will be...
fewer cycles of the wave passing a point per second
V is
frequency
The greater the radius of the orbit, the_____ the energy of that orbit.
higher
As temperature increases, the average energy of the emitted radiation...
increases
The longer the wavelength, the ____ the frequency.
lower
SI units for wavelength of light
meters
SI units for the speed of light
meters/seconds
_____ and ______ are common wavelength units for infrared radiation.
millimeters and micrometer
Only orbits of certain radii, corresponding to certain definite energies, are...
permitted for the electron in a hydrogen atom
According to Bohr, an electron in a permitted orbit has a ______ and is in an ______ energy state.
specific energy, allowed
According to Bohr, energy is emitted or absorbed only as...
the electron changes from one allowed energy state to another
C is
the speed of light
Wavelengths associated with macroscopic objects are...
too small to allow for any way to observe them
Electromagnetic spectrum shows...
various types of electromagnetic radiation arranged in order of increasing wavelength.