What does Wave length 650nM means?

What happens if a source of sound is moving toward you at a high rate of speed? How much dos the average pea weigh? What acceleration occurs if thefriction force is 4 N? Why does light reflected off white paper hurt your eyes? What size BP cuff do you use on a 6 month old who weighs 7kg? What is air borne vibrations? What might a substitute product for a ball point pen be? Does a low SAR rating also mean low reception? What does a change in the shape of the wavefront? How do you explain the difference between conduction convection or radiation can transfer heat explain? What does the radiation include? Is argon a conductor of thermal energy? Are neutrons neutral and electrons? How do you work out the resultant of opposing forces? What are the physical characteristics of diamonds? What happen when lens is slowly lifted up from glass plate? Does gamma rays per second effect physical half-life? How is it possible for an atom to have no charge even though it is made up of protons neutrons and electrons? What is the ability of one system to cause change in another system called? What is the meaning of submerged unit weight and submerged weight?

What does Wave length 650nM means?