i have an aftermarket alarm on my car and just recently had my window smashed open. it didnt even go off! what are glass breaking sensors? should i add them to my current alarm? can i also make my alarm be more sensitive so it will go off if someone taps the car? ive seen this remote with a pic of a car and it blinks and sounds and shows u where the car was touched.
I agree with others, the answer is D. The explanations may be found at your state's (or Philippines' if there is) driver handbook and driver license study guide.
The best IR detectors are currently semiconductors with an energy bandgap in the IR range. This is small, so heat makes a lot of electrons flow between the conduction and Valence bands; you really have to cool them down to make them work well. (often to very cold: liquid nitrogen type temps) Pyroelectric sensors can also work, but they're much grainier. This is a fundamental limit of our materials; given my current knowledge of solid state physics I'd guess that we would have to have a separate IR detector that wirelessly transmits the info to the lenses. I could be completely wrong, this is taken from the half a degree level course I've done in condensed matter physics. Maybe the second half will have an explanation of a way around this. :)
The infrared scene in front of you must be converted to a visible-light image, and you must be able to focus that image on your retina. With goggles, the image is a couple inches away from your eye, and you are able to focus on it because the goggles contain special reading glasses. Conceivably, someone may someday invent a holographic contact lens which presents an imaginary 3D image where you can focus on it. That technology is probably decades into the future.
