1. Free Probeware Resources
a. Audio Analysis
The relationship between wavelength and pitch is the longer the wavelength the lower the pitch and the shorter the wavelength the higher the pitch.
b. Vision Analysis
After completing the vision tests, I do not have any vision problems.
Here is an optical illusion that I could use in class:
This image comes from the Exploratorium website, I would use this image to reinforce how our eyes are constantly scanning images to stimulate different rods and cones so that a continuous signal is sent to the brain. If we stare at one place too long, the receptors become tired and the stop sending new signals to the brain which causes the dot in the middle to disappear. As soon as the eyes are moved to look at something different, the blue dot reappears.
c. Response Time & Time Estimation
My response time is faster with sound stimuli.
How good is your estimation of time?
I was relatively close when estimating 30 seconds.
My relative error is 7.9%
2. Data Acquisition with Probes
Investigation: Inverse Square Law
Have students choose three points from the following table and use the information from the graph to determine if the intensity of the light follows the inverse square law.
David and Karen testing the inverse square law as it relates to light intensity and distance.
3 & 4 - Skip
5. Using Probeware to Test the Understanding of Concepts
Using motion-detecting probes, re-create the following 6 graphs.
Krista and Marissa simulating the motion graphs by moving a plate in front of the motion sensor.
6. Design Three of Your Own Experiments Using Probeware:
Experiment 1: Endothermic vs. Exothermic Reactions
1. Mix 3 grams of calcium chloride into 150 mL of water. Using the temperature probe, create a graph of the change in temperature over time as the reaction occurs.
2. Is this reaction endothermic or exothermic? Explain how you know this.
This reaction is exothermic - the temperature of the products is greater than the temperature of the reactants.
3. Mix 3 grams of ammonium nitrate into 150 mL of water. Using the temperature probe, create a graph of the change in temperature over time as the reaction occurs.
4. Is this reaction endothermic or exothermic? Explain how you know this.
This reaction is endothermic - the temperature of the reactants is greater than the temperature of the products.
Images of David, Krista, Marc, Karen, and Marissa performing the endothermic/exothermic experiment.
Experiment 2: Work Required for Maximum Voltage Output
1. What generates the most voltage? Use the hand generator, connected to the volt current meter, and create a graph of the voltage generated by cranking the hand generator.
2. Explain what you did to create the most voltage.
The faster we turn the hand generator, the more voltage we created.
Image of me using the hand generator to generate voltage.
Experiment 3: pH of Various Liquids
1. Use the pH probe to determine the pH of several different liquids that are provided for you. Create a table of your data.
2. Describe the liquids that have a low pH. These substances are known as _______________.
3. Describe the liquids that have a high pH. These substances are known as _______________.
Data Collected with pH Probeware:
pH of Coca Cola Black
pH of Gatorade Orange
pH of Max Velocity Energy Drink
pH of Milk
pH of Tap Water
pH of Sobe Lean Grapefruit Drink
Image of the pH lab in action: