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A filtered education March 3, 2014

Posted by mareserinitatis in education, homeschooling, math, older son, physics, science, societal commentary, teaching, younger son.
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The older son is a lot of fun.  Despite his statements that he has no desire to go into science, he seems to get and make a lot of science jokes.  I know he’s not a scientist, but I feel comfortable that he’s scientifically literate.  As he was homeschooled, I’m feeling pretty proud of myself.

I’m more anxious about the younger son, though.  This weekend, he brought home his science homework, which focused on optics.  The kids were studying filters, and one of the questions asked about what kind of light would you see if you shined a flashlight through a blue filter and then a red one.  I asked him what he saw, and he said nothing.  Unfortunately, he was told that he saw nothing because the flashlights just weren’t bright enough, but that what he should have seen was purple.

I’m pretty sure that if I had ever been bombarded with gamma rays in the past, I would’ve turned into She-Hulk at that very moment and started smashing things.  Fortunately (or unfortunately, if being She-Hulk happens to be a goal of yours), that didn’t happen.

I find it infuriating that, throughout my years of homeschooling older son and teaching younger son math, I have constantly been questioned about my ability to teach them.  The implication has always been that I may have a degree, but they are experts on teaching.  In fact, this particular teacher attempted to take me to task earlier this year about the younger son’s math curriculum…the same teacher who apparently doesn’t understand that light and pigments work completely differently.

After I managed to calm down, I explained that light filters are like sieves, except that they only let one size of particle pass through: nothing bigger can pass through the holes, but nothing smaller can, either.  After this explanation, the younger son was able to correctly explain that the reason he saw no light from his flashlight is that the two filters together had blocked all the light.

I’m going to be watching very carefully to see what kinds of scores he’s getting on his answers and whether the teacher realizes she made a mistake.  This was very disappointing.  There was a new science curriculum introduced this year, one which I was very excited about.  The focus was supposed to be on hands-on, problem-based learning, which is great for science.  Despite that, it seems that younger son’s science education may be lacking.  What good does it do to have a top of the line science education curriculum (or math…or anything else) when our teachers don’t understand what they’re teaching?  And how is it that these same teachers can justify questioning the ability to teach material that some of us understand far better than they do?

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Friday Fun: What is your favorite wavelength? August 2, 2013

Posted by mareserinitatis in electromagnetics, Friday Fun, physics.
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I want to know everyone’s favorite color…by their wavelength.  If you need help, here you go:

spectrum

My personal favorite is right around 400 nm.  And it’s entirely for aesthetic reasons.

So what is yours and why?

(Yeah, I know…everyone is going to pick some non-optical frequency.  And yes, you have to stick to photons.  Maybe we can do sonic waves another week…)

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