A machine does 1000 J of output work when 2000 J of work is input. THe efficiency is

If you quadruple the temperature of a black body, by what factor will the total energy radiated per second per square meter increase? 1,024 64 16 4 256 submit answer

Infrared radiation has wavelengths that are shorter than visible light is part of the visible light spectrum has wavelengths that are longer than visible light has the same wavelengths as ultraviolet radiation

Often called simply "velocity," this is the velocity of an object at a particular moment in time.