In a laboratory where the air temperature is 22°c, a steel cylinder at 100.°c is submerged in a sample of water at 40.°c. in this system, heat flows from

In a laboratory where the air temperature is 22°C, a steel cylinder at 100.°C is submerged in a sample of water at 40.°C. In this system, heat flows from the steel cylinder to the water, and the water to the container and air. This is because heat always flows from a higher temperature to a lower temperature. 

Determine the  wavelength of light emitted when an electron  in an li2+ ion  makes a transition from an orbital with n  =  6 to an orbital with n  = 5.