A ruby crystal rod operates as an amplifier for the radiation at λ! = 694.3 nm that coincides with the central wavelength of the rubyâs atomic transition. The quantum efficiency of the transition is close to 100 %, the spontaneous emission lifetime is t!" = 4.3 ms, and the transition cross section at the central wavelength is ð(λ!) = 2.5 x 10!!" cm!.
a) Assuming a homogeneously broadened Lorentzian transition lineshape, calculate the transition bandwidth Îv (FWHM).

Two technicians are discussing the intake air temperature (iat) sensor. technician a says that the computer uses the iat sensor as a backup to the engine coolant temperature (ect) sensor. technician b says that the powertrain control module (pcm) will subtract the calculated amount of fuel if the air measures hot. who is correct

If a particle moves along a path such that r : (3 sin t) m and ? : 2t rad, where t is in seconds. what is the particle's acceleration in m/s in 4 seconds? a)- 16.43 b)- 16.29 c)- 15.21 d)- 13.79

For the closed feedwater heater below, feedwater enters state 3 at a pressure of 2000 psia and temperature of 420 °f at a rate of ix10 ibhr. the feedwat extracted steam enters state 1 at a pressure of 1000 psia and enthalpy of 1500 btu/lbm. the extracted er leaves at an enthalpy of 528.7 btu/lbm steam leaves as a saturated liquid. (16) a) determine the mass flow rate of the extraction steam used to heat the feedwater (10) b) determine the terminal temperature difference of the closed feedwater heater