1. Calculate and record your Chapter # 3 Test % grade. 2. Did you meet your goal? Why or why not. 3. Study (preparation) Plan for next test? Day

1. Average your first three test grades. 2. Your new goal must be:  A passing grade  at least a 2 point improvement of your average. Day

You do not have to write this down: Get out your test corrections and your test. Make sure you are done – we will be handing them in momentarily. Extra Credit (ALL make up must be done first!!!): #s 41, 47, 48, 49, and 50 on page 122 Day

1. An atom has 9 protons, 10 electrons, and 10 neutrons. What is the mass #? What element is it? What is the charge? Draw the nuclear symbol? Day F 19 9

Read section 5.3 and answer #s 19, 20, 22, and 23 on page 148 Assignment Extra Credit (ALL make up must be done first!!!): #s 41, 47, 48, 49, and 50 on page 122

Hand in any and all work from last week NOW: Test corrections Make up page 148 Page 122 (extra credit) Question of the Day: Day

What is the dual nature of light?

Radiant Energy travels through space is energy that travels through space. light Is also known as light and electromagnetic radiation electromagnetic radiation. Major source is… THE SUN

The dual nature of light Particle??? Wave??? The dual nature – light can be viewed as a wave (continuous) OR a stream of extremely tiny, fast- moving particles (quantized)

The dual nature of light Particle??? Wave??? - Wave (continuous) as it travels through space - Particle (quantized) as it interacts with matter

Electromagnetic Spectrum ordered sequence light electromagnetic radiation The ordered sequence of all types of light or electromagnetic radiation.

The part of the electromagnetic spectrum that humans can see is called the … radio, micro, radar, IR, vis. Electromagnetic Spectrum vis., UV, X-ray, gamma, cosmic Low, low & Long! High, high & short!

Violet- High energy, bends more, inside of rainbow, 400 nm R O Y G B I V Red- Low energy, bends less, outside of rainbow, 700 nm

The energy of green light compared to that of red light is ___________.

Read section 5.3 and answer #s on page Due at the end of class Wednesday Assignment

Light acts as a: wave as it … particle as it … USE YOUR NOTES!!! Day

Sir Isaac Newton …in the 1670’s, diffracted light with a prism and… Concluded that each color of light has a unique wavelength… energy

Electromagnetic Spectrum h a

amplitude (a) - affects brightness, half the height Frequency (ν) = number of crests passing a point in a period of time speed (c) = distance per unit time wavelength (λ) = crest to crest

λ = c/ν wavelength speed of light frequency

λ = c ÷ ν λ = wavelength c = speed of light = 3.00 * 10 8 m/s ν = fequency (s -1, Hz, 1/s)

Example Problem λ = (3.00*10 8 m/s)÷(9.31*10 7 s -1 ) λ = 3.22 m What is the wavelength if the frequency is 9.31*10 7 s -1

Max Planck energy - related the frequency of light to its energy with the following: E = h Energyh=Planck’s const. E=Energy, h=Planck’s const. specific amounts His idea was that energy is absorbed and released in specific amounts. Quantum Theory Page e-34 J*s

specific amounts quantum quanta atoms His idea was that energy is absorbed and released in specific amounts. He called one piece, package, or bundle of energy one quantum. Bundles of energy were called quanta. He applied his quanta ideas to energy changes in atoms: Quantum Theory

atoms quantized He applied his quanta ideas to energy changes in atoms: The energy of atoms is quantized. continuous (wave-like) Formerly, scientists had thought that all energy was continuous (wave-like). Quantum Theory

Read section 5.3 and answer #s on page Due Wednesday Assignment

1. Amplitude affects __________. 2. Shorter wavelengths = ______ frequencies USE YOUR NOTES!!! higher brightness Day

λ = c/ν wavelength speed of light frequency

E = h Energyh=Planck’s const. E=Energy, h=Planck’s const e-34 J*s

Radiant Energy travels through space is energy that travels through space. light Is also known as light and electromagnetic radiation electromagnetic radiation. Major source is… THE SUN

The dual nature of light Particle??? Wave??? - Wave (continuous) as it travels through space - Particle (quantized) as it interacts with matter

amplitude (a) - affects brightness, half the height wavelength (λ) = crest to crest

Read section 5.3 and answer #s on page Due at the end of class Thursday Assignment

1. What is another name for radiant energy? 2. What is the dual nature of light? USE YOUR NOTES!!! Day 6 1-6

λ = c/ν wavelength speed of light frequency

E = h Energyh=Planck’s const. E=Energy, h=Planck’s const e-34 J*s

Radiant Energy travels through space is energy that travels through space. light Is also known as light and electromagnetic radiation electromagnetic radiation. Major source is… THE SUN

The dual nature of light Particle??? Wave??? - Wave (continuous) as it travels through space - Particle (quantized) as it interacts with matter

amplitude (a) - affects brightness, half the height wavelength (λ) = crest to crest

Democritus’ atom Quantized Matter:Energy:Plank

Continuous: VS. Quantized: Height by step or rung Height on slide or ramp

Continuous: VS. Quantized: Ice cream scoops Soft-serve ice cream

Continuous: VS. Quantized: Come up with your own.

Albert Einstein - Imagined that light energy traveled in bundles - photons. 18 years later, Arthur Compton experimentally demonstrated that light is comprised of tiny particles, or photons, Quantum Theory

TODAY - Planck’s term quantum and Einstein’s term photon are used interchangeably. demonstrated that light is comprised of tiny particles, or photons, that can collide with electrons and cause them to move. Quantum Theory

TODAY - Planck’s term quantum and Einstein’s term photon are used interchangeably. Scientists also believe that light has properties of both waves and particles. Quantum Theory … - Dual nature of light

DEFINE: energy level AND atomic orbital AND Read section 5.1 AND answer questions 1, 2, 4, and 5 on page definitions and 4 questions