What is the best description of black body radiation?

a. 

radiation that comes from a heated object

b. 

radiation that's always invisible

How much energy is supplied to each coulomb of charge that flows through a 12-v battery?

What are some important factors to consider when choosing a warm-up before your workout?

Which lists the amplitudes of sound waves from these sources in order from greatest to least? busy roadway, kids whispering, average home chainsaw, diesel truck, rustling leaves kids whispering, vacuum cleaner, jet airplane library, conversational speech, music from speaker