Laser beam is made of a /electrons
/highly coherent photon
excited atoms
elastic particles​

What are two different ways you could find the value of a? explain these methods.

Sound is a disturbance that travels through a medium as a

Air is contained in a variable-load piston-cylinder device equipped with a paddle wheel. initially, air is at 400 kpa and 17°c. the paddle wheel is now turned by an external electric motor until 75 kj/kg of work has been transferred to air. during this process, heat is transferred to maintain a constant air temperature while allowing the gas volume to triple. calculate the required amount of heat transfer in kj/kg.