. The photodiode will be collecting light from the LED (signal) and other sources like the sun, room lights, laptop screen, etc. (background). We can set the frequency of the LED signal (how rapidly it flashes) higher than these sources and then filter out the background frequencies. The sun provides DC light and light bulbs generally operate at 60 Hz or 120 Hz (50 or 100 Hz in some countries). Therefore, we should use frequencies above these values. Our choices are constrained at the high end as well. What is the maximum frequency we should operate the LED at to get a good signal at the photodiode

What is the type of the reaction below? bacl2 + h2so4 → 2 hci + baso4 double replacement synthesis single replacement decomposition

There is a theory that indicates that dinosaurs became extinct when about 65 million years ago, a large asteroid hit the earth surface. dust caused by this collision blocked the sunlight reaching the earth's surface and many forms of life became extinct due to the cold. fearing this threat, how large the radius of an asteroid should you be looking for if the dangerous asteroid size is approximately the same as the one that killed the dinosaurs? available data suggests that about 18% of that asteroid's mass ended up as a dust spread evenly over earth after eventually settling out of the upper atmosphere. about 0.0180 g/cm^2 of dust, which is chemically different than the earth's rock, covered the earth's surface. typical asteroids have a density of about 1.9 g/cm^3. now that we know the size of the asteroid, how much energy was released during impact, assuming all of it was just the kinetic energy of the asteroid right before the impact?

Energy flows from the producer level to the level. is called