velengths enters the mon\avelengths and reflects it towards a second mirror. Light reflects off the second mirror. One wavelength exits the monochromator and the other wavelength does not. It diffracts radiation into different wavelengths and disperses it at different angles. It refocuses the collimated radiation. It splits the radiation into parallel rays. It is what the refocused radiation of different wavelengths is focused onto. It is where monochromatic radiation leaves the monochromator. It is where polychromatic radiation from the source enters the monochromator. Answer Bank

Aforce of 240.0 n causes an object to accelerate at 3.2 m/s2. what is the mass of the object?

Aball is thrown upward in the air, and its height above the ground after t seconds is h ( t ) = 57 t − 16 t 2 feet. find the time t when the ball will be traveling upward at 14.25 feet per second.

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