) The speed of an electromagnetic wave in vacuum depends on a) the amplitude of the electric field, but not on the amplitude of the magnetic field. b) the amplitude of the magnetic field but not on the amplitude of the electric field. c) the amplitude of both fields. d) the frequency and wavelength. e) none of the above.

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.

Ithink c because you have to work to become goid

Sound wavelength of visible light waves