Humans can see electromagnetic radiation when the wavelength is within the spectrum of visible light. create a program to determine if a user-specified wavelength [nanometer, nm] is one of the six spectral colors listed in the following chart. your program should ask the user to enter a wavelength, then indicate in which spectral color the given wavelength falls or state if it is not within the visible spectrum.

Athin walled concentric tube exchanger is used to cool engine oil from 160°c to 60°c with water that is available at 25°c acting as a coolant. the oil and water flow rates are each at 2 kg/s, and the diameter of the inner tube is 0.5 m and the corresponding value of the overall heat transfer coefficient is 250 w/m2. oc. how long must the heat exchanger be to accomplish the desired cooling? cpwater=4.187 kj/kg-candcpengine el=2.035 kj/kg·°c, oil . 120]