What is true about electromagnetic waves that is NOT true about mechanical waves? A. Electromagnetic waves have lots of energy
B. Electromagnetic waves can not travel in vacuum
C. Electromagnetic waves have high frequencies
D. Electromagnetic are made up of massless particles

Calculate the ratio of h+ ions to oh– ions at a ph = 7. find the concentration of h+ ions to oh– ions listed in table b of your student guide. then divide the h+ concentration by the oh– concentration. record this calculated ratio in table a of your student guide. compare your approximated and calculated ratios of h+ ions to oh– ions at a ph = 7. are they the same? why or why not? record your comparison in table a. what is the concentration of h+ ions at a ph = 7? mol/l what is the concentration of oh– ions at a ph = 7? mol/l what is the ratio of h+ ions to oh– ions at a ph = 7? : 1

Which metal exist in liquid state and can be cut with knife ?

What is the atomic number of an atom that has 6 protons