Your physics professor is foolishly standing out in a field during a thunderstorm and measures two bolts of lightning to hit two trees at opposite ends of the field at exactly the same time. you, being considerably less foolish, are driving by in a car on a road right next to the field at a speed v when the lightning bolts strike the trees, one of which is in front of the car, the other of which is behind it. you happen to line up with the professor right when he observes the lightning bolts strike the trees. as measured by you in the car, a. the lightening bolts appear to hit at dofferent times, but once you factor in your speed in the car, you will agree that the bolts hit the trees at the same time. b. the lightening bolts do not hit both trees. c. the lightning bolts hit the trees at the same time. d. the lightening bolts do not hit the trees at the same time.

Comedians like to joke that the reason we haven’t been visited by intelligent life from elsewhere in the universe is that aliens have been monitoring earth’s broadcasts of intellectually embarrassing tv programs, like gilligan’s island, fear factor, the jersey shore, and the jerry springer showand so consider us far too primitive to merit a visit. let’s check the assertion that aliens could have been receiving them. tv programs are broadcast at a frequency of about 100mhz with about 100kw of total power in 30frames per second, which emanatesroughly uniformly in all directions. assume that interstellar space transmits these broadcasts without attenuation. no matter how smart they are, aliens would require at least one photon per frame to interpret our signals. findthe number of photons per unit time per unit area reaching a receiver on a possible planet in the nearest star system, which is about 4 light-years away (a light-year is the distance light travels in a year). if aliens aimed a receiver or detector directly at earth, how big (in diameter) would it have to be to receive a photon per frame

What is the power rating of the lightbulb if 3.0 a flow through it when connected to a 15 v battery

Listed following are various physical situations that describe how light interacts with matter. match these to the appropriate category. 1) transmission? -visible light meets clear glass -visible light does not pass through a black wall -red light hits a red sweatshirt -light comes from your computer screen -cell phone signals pass through walls -blue light hits a red sweatshirt -white light hits a white piece of paper -light comes from a light bulb