Chapter 7 Flashcards
What is a form of electromagnetic radiation we can see?
Light
What are some forms of electromagnetic radiation we cannot see?
Microwaves, radio signals, x-rays
Most subatomic particles behave as ___________ an obey the physics of waves.
Particles
What are parts of zero amplitude?
Nodes
What is the length between crests of different waves?
Wavelength
The height of the wave from zero amplitude is what?
Amplitude
Waves also have ____________.
Frequency
What Greek letter do we use for frequency?
nu or V
What are the units of nu “V”?
Cycles per second
All electromagnetic radiation has what equation?
Wavelength x frequency = the speed of light
What is the speed of light?
3.00 x 10^8 m/sec
Long wavelength = _________ frequency.
Small
Short wavelength = _________ frequency
High
Who solved the ultraviolet catastrophe?
Max Planck
Max Planck discovered that an object can gain or lose energy by absorbing or emitting ____________ energy in quanta.
Radiation
What is quanta?
Discrete specific amounts of energy
The energy of radiation is proportional to the ___________.
Frequency
What is Plancks equation?
E = n x h x v
(h plancks constant)
(n is quantum numbers)
When wavelength increases energy (intensity) also ___________.
Increases
Light with large wavelengths has _________ energy.
Small
Light with short wavelengths has _________ energy.
Large
Who explained the photoelectric effect using and experiment to demonstrate the particle nature of light?
Einstein
There were no ejected electrons observed until light of a certain minimum __________ is used. (Or minimum frequency)
Energy
Once minimum energy is obtained, the number of electrons ejected depends on the what?
Light intensity (number of photons)
Particles of electromagnetic energy whose energy is proportional to the frequency of the radiation is called what?
Photons
Bohr’s greatest contribution to Science was building a simple model of the ________.
Atom
Bohr’s model of the atom was based on an understanding of what?
Sharp line spectra of excited atoms
Line spectra of excited atoms: Excited atoms emit light of only certain _______________.
Wavelengths
Line spectra of excited atoms: The wavelengths of light emitted depends on the ___________.
Element
Visible atoms in the H-atom spectrum are called the what?
Baller series
The new theory Bohr came up with for electron orbit is called the what?
Quantum or wave mechanics
Electrons can exist only in certain discrete orbits called what?
Stationary states
Electrons are restricted to quantized energy states called what?
Energy levels
What is the energy of states equation?
En=-RH/n^2
The energy is state equation is also called the ________ equation.
Bohr
Only energy levels where n=_________ are permitted in the energy of state equation.
Integer
Bohr’s equation can be used to explain atomic ___________.
Spectra
If electrons are in quantized states then the difference in energy of these states can only have __________ values.
Certain
When an electron is promoted to a higher energy orbital it needs to absorb a __________ amount of energy.
Defined
When an electron is promoted to a higher energy orbital it’s a ____________ process.
Endothermic
When excited electrons move down to lower energy levels they _________ energy as light.
Emit
What is the source of the lines observed in the emission spectrum of hydrogen?
Electrons moving down energy levels emit light
