How was bohr's atomic model similar to rutherford's model? a. it assigned energy levels to electrons. b. it described electron positioning in terms of the electron cloud model. c. it described how electrons gain or lose energy. d. it described a nucleus surrounded by a large volume of space.

Infrared rays have a shorter wavelength than question 11 options: x-rays. ultraviolet rays. radio waves. gamma rays.

Air is to be preheated by hot exhaust gases in a cross-flow heat exchanger before it enters the furnace. air enters the heat exchanger at 95 kpa and 20°c at a rate of 0.6 m^3/s. the combustion gases (cp = 1.10 kj/kg°c) enter at 160°c at a rate of 0.95 kg/s and leave at 95°c. determine the rate of heat transfer to the air and its outlet temperature.

Which of the following are guidelines to follow for obtaining accurate observations