Spectra

Today we talked about identifying elements by their spectra.

We had some short notes and another practice problem like bellwork: Spectra of Elements. Your homework is Quantum IV.

Emission and Absorption of Photons

Bellwork and notes both went on the board today. Sorry the picture is so dark - my editing app just kept crashing and I gave up.

If you missed the lecture, these sites do a pretty good job of explaining:

 Regents Prep - Bohr Model

McGraw-Hill - Play with Absorption/Emission
University of Toronto - Another Animation of Bohr Model

Homework is Quantum III.

Discrete Energy Levels

Remember, the Bohr Model is not technically correct, but it helps us explain why only certain energy levels are allowed.

Here is a nice animation of the electron standing waves around the nucleus from the University of Toronto.

Homework: Quantum II.  Note that the wavelength of electrons for does change with the energy level - the speed changes, which affects the deBroglie wavelength.  But in #3 and #4 on the homework, we're going to simplify things a bit and assume the electron wavelength is the same for all energy levels.

Particles as Waves

We meandered a bit because it's AIMS day and I'm fried from walking for 3.5 hours in a silent room...but today we talked about particles acting like waves. Below are some notes from a few years ago that are more detailed than the ones we took on bellwork.

Homework tonight is deBroglie Wavelength.

Measurement Error Lab

Today we are worked on a lab that is sort of tied to the uncertainty of measurement that occurs in quantum mechanics.

Measurement Error Lab

Have a great Rodeo Break. Remember that AIMS is on Monday and Tuesday, so if you've already passed Reading and Writing you don't have to come in until 10: 30 (lunch) and class starts at 11:30. buses pick up 3.5 hours later than usual. If you're taking AIMS, get to school at the regular time.

Practice: Quantum I

I want to solidify what we already know before we get into the really weird quantum mechanics stuff, so today you just completed Quantum I for practice.

Quantum I Conceptual (period 1)
Quantum I Honors (periods 4,5,6)

The Photoelectric Effect

Today we talked about the photoelectric effect. Bellwork:

Here is a simulation we looked at. Honors classes also had a reading and a homework that goes with it. Period 1 can do those for extra credit if they wish.

Quanta and Photons

Bellwork:

Notes: Quanta and Photons

Homework: Photons

Marble Lab

Today you are completing the Marble Lab. We talked about the setup yesterday. It is due Thursday, but you should have enough time to complete it today.

Rutherford's Gold Foil Experiment and Marble Lab Set Up

Today we talked about Rutherford's gold foil experiment and why it was important.

We then talked about the lab tomorrow and how to set it up.

And finally we went through the probability math to show how this lab will allow us to find the diameter of marbles without measuring them directly. Sort of how Rutherford was able to measure the size of gold atoms' nuclei without being able to touch them.

Atoms

Today we more clearly defined the atom and clarified the "electron cloud" part of the electron cloud model. The rest of the period was spent finishing your atom model timeline, which is due today, or starting tonight's homework: Atoms.

History of of the Model of the Atom

Today we read a short (abridged) history of how our current model of the atom was developed. Your homework is to turn this into a timeline, due tomorrow.

Reading
Homework

Here is bellwork:

Study Guide

Today we counted stamps (all January stamps) and started work on your study guides. You'll have some of your block day work time, too, and we'll take the test during the last 50 minutes of your block day.

Study guides: honors, conceptual

Some of you were taking that alternative assessment last week. Those students have the option of taking the test at a later time, but it is YOUR responsibility to take it after school. I will not remind you. If I still don't have a test from you in two weeks, you are getting a zero.

Here are the abridged answers to the study guide. The difference between honors and conceptual are in blue.

Shadows and Eclipses

Today we talked about shadows and eclipses. Here is the bellwork:

But the parts of shadows are a bit better explained here.

Next we talked about eclipses in the context of shadows. A good explanation is here. We looked at NASA's Eclipse website and watched some time lapse videos of eclipses (lunar, solar). Finally, I tried to convince all of you to plan a road trip to see the August 21, 2017 total solar eclipse.

No homework this weekend, but I'm still missing A LOT of Light Review sheets. You have a test coming up on your next block day.