A monochromatic beam of light has a frequency of 6.5 x 10" hertz. What color is the light? O orange
O yellow
O violet
O blue

Asun-sized star will spend most of its lifetime as a: white dwarf red giant protostar main-sequence star

Calculate the work done by an external agent during an isothermal compression of 1.00 mol of oxygen from a volume of 22.4 l at 10∘c and 1.0 atm pressure to 16.8l

An insulated 40 ft^3 rigid tank contains air at 50 psia and 120°f. a valve connected to the tank is now opened, and air is allowed to escape until the pressure inside drops to 25 psia. the air temperature during this process is kept constant by an electric resistance heater placed in the tank. determine the electrical work done during this process.