Presentation on theme: "Creating a foldable for the electrons in atoms notes"— Presentation transcript:
1 Creating a foldable for the electrons in atoms notes Fold paper into 3 sections
2 c = λ v Equantum = hv Ephoton = hv Other relevant Info.White light can be separated into ________________________________________________The color with the highest frequency is_______/ with the lowest frequency is _________List the different forms of electromagnetic radiation in order of least to greatest frequency:________________________As photon energy increases, what happens to wavelength and frequency?_______________________________Formulas to rememberElectromagnetic wave relationshipc = λ vUsing Planck’s constantEquantum = hvPhotoelectric EffectEphoton = hvWhat do the variables stand for?Equantum (J)= ______________Ephoton (J) = _______________λ (m, cm, nm) = _____________h (J∙s) = __________________v ( Hz, s-1)= ________________c (m/s)= ___________________h = x J∙s J is joules and is the unit for energyc = 3.00 x 108 m/sElectromagnetic RadiationDefinition:Characteristics of WavesWavelength (λ):Frequency (v):Amplitude:Draw and Label the parts of a wave:
3 On the back of your foldable… Make sure to show your work!! Practice ProblemsFormula:Work:Ans with correct units and proper sig figs.Name:__________Date: _________Period:_______What is the wavelength of a microwave with a frequency of 5.22 x 108 Hz?Formula:Work:Ans with correct units and proper sig figs.Calculate the frequency of photon that has an energy of x JWhat is the energy of a quantum with a frequency of 1.05 x 1016 s-1Formula:Work:Ans with correct units and proper sig figs.
4 Chapter 5 in your text pp. 117-141 Electrons in AtomsChapter 5 in your textpp
5 When did studying light become important? In the early 1900’s scientist discovered that certain elements gave off visible light when heated in a flame. Analysis of this light revealed that an element’s chemical behavior is related to the arrangement of electrons.Because of this, it became important to understand nature of light
6 Wave Nature of LightElectromagnetic radiation: a form of energy that exhibits wavelike behavior as it travels through space.ExamplesVisible light from the sun, microwaves, x-rays, radio waves, etc
7 Characteristics of Waves Wavelength: λshortest distance between equivalent points on a continuous wave; measured from crest to crest or trough to troughexpressed in meters, centimeters, or nanometersFrequency: vThe number of waves that pass a given point per secondExpressed in hertz (Hz or s-1)AmplitudeWave’s height from the origin to a crest or origin to a troughcrestamplitudeorigin
8 Electromagnetic Wave Relationship All electromagnetic waves travel at the speed of light (C) 3.00 x 108 m/sc = λ vwhere c is the speed of light, λ is wavelength, and v is frequencyExample:What is the wavelength of a microwave with a frequency of 3.44 x 109 Hz?λ = c/v λ = 3.00 x 108 m/s = x 10-2 m3.44 x 10 s-1
9 Electromagnetic Spectrum Although the speed of Electromagnetic waves is the same, wavelengths and frequencies can be different(ex: higher frequency = shorter wavelength)White light, such as sunlight, can be separated into a continuous spectrum of colors if passed through a prism. These are the colors of the rainbow (roy g biv – red, orange, yellow, green, blue, indigo, violet)
10 Electromagnetic Spectrum Electromagnetic spectrum (EM spectrum) is all forms of electromagnetic radiation where the only difference in the types of radiation is their wavelengths and frequencies
11 Particle Nature of Light The wave model couldn’t explain the emission of the different wavelengths. In 1900, Max Planck studied the light given off by heated objects. His studies led him to the conclusion that matter can gain or lose energy in small amounts called “quanta.”A Quantum is the minimum amount of energy that can be gained/lost by an atom
12 Planck’s Constant Equantum = hv Equantum is energy, h is Planck’s constant, and v is frequencyThe value for Planck’s constant is x J∙sJ is joules and is the unit for energyExample: What is the energy of a photon from the violet portion of the Sun’s light if it has a frequency of x 1014 s-1 ?Ephoton = (6.626 x J∙s) (7.230 x 1014 s-1 )= x J
13 Photoelectric effectPhotoelectrons are given off a metal’s surface when light of a certain frequency shines on the surfaceEinstein proposed light has a dual nature- A beam of light has wavelike and particlelike properties. A beam of bundles of energy were called photons (massless particle that carries a quantum of energy.Ephoton = hvAs the energy of a photon increases, the frequency increases. What can you conclude about the wavelength.