A strong , sharp absorption at about 1730 wavenumbers (IR) (True) A sharp singlet in the region of delta = 3.5 ppm (NMR) An important pair of moderately strong absorptions at about 800 and 900 wavenumbers (IR) A strong , broad absorption at about 3300 wavenumbers (IR) A triplet at about delta = 2.2 ppm , integrating for 2 protons (NMR)

the answer is a and have a great day

in the analysis of systems that involve fluid flow, we frequently encounter the combination of properties u and pv.

it can be observed without changing the identity of the object.

it depends on what substance you're talking about as well as many other factors. in quantum mechanics, the observation of particles affects the observers ability to measure certain properties. for example: you can know the velocity of a particle, but you can't know it's position; or you can know it's position, but not it's velocity. it's like trying to find out where a grain of sand is by throwing other grains of sand at it. once you find out where it is, it's been moved. it's also like trying to find an answer to the question of whether or not a tree falling in a forest makes a sound if nobody is there to hear it. paradoxically, the only way to find out is to be there and hear it.