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 remember
Electromagnetic wave relationship
c = λ v
Using Planck’s constant
Equantum = hv
Photoelectric Effect
Ephoton = hv
What 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 energy
c = 3.00 x 108 m/s
Electromagnetic Radiation
Definition:
Characteristics of Waves
Wavelength (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 Problems
Formula:
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 J
What is the energy of a quantum with a frequency of 1.05 x 1016 s-1
Formula:
Work:
Ans with correct units and proper sig figs.

4. Chapter 5 in your text pp. 117-141
Electrons in Atoms
Chapter 5 in your text pp

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 Light
Electromagnetic radiation: a form of energy that exhibits wavelike behavior as it travels through space.
Examples
Visible light from the sun, microwaves, x-rays, radio waves, etc

7. Characteristics of Waves
Wavelength: λ
shortest distance between equivalent points on a continuous wave; measured from crest to crest or trough to trough
expressed in meters, centimeters, or nanometers
Frequency: v
The number of waves that pass a given point per second
Expressed in hertz (Hz or s-1)
Amplitude
Wave’s height from the origin to a crest or origin to a trough
crest
amplitude
origin

8. Electromagnetic Wave Relationship All electromagnetic waves travel at the speed of light (C) 3.00 x 108 m/s
c = λ v
where c is the speed of light, λ is wavelength, and v is frequency
Example:
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 m
3.44 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 frequency
The value for Planck’s constant is x J∙s
J is joules and is the unit for energy
Example: 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 effect
Photoelectrons are given off a metal’s surface when light of a certain frequency shines on the surface
Einstein 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 = hv
As the energy of a photon increases, the frequency increases. What can you conclude about the wavelength.