A beam of natural light is incident on the surface of a piece of glass of index 1.54 at an angle of incidence of 60 degrees. What fraction of the incident light is reflected

If the heat engine is a perfect carnot cycle engine, thenefficiency = (t2-t1)/t2   where t1=temperature of cold reservoir ( ° k) = 135            t2=temperature of hot reservoir ( ° k)   = 325thereforeefficiency = (t2-t1)/t2 = (325-135)/325 = 0.5846 = 58%  note: this is the theoretical maximum efficiency of a perfect heat engine.   real-life engines do not achieve this value.

It is either a  proton or a neutron im almost positive. hope this .

The correct answer is waves

The waves slow downn