SPECTROSCOPY

The diffraction grating

None of these

The entrance slit

The collimating lens

when the frequencies match exactly

when the amplitudes are the same.

at anytime.

at no time.

none of these

n → π* and π → π*

n → σ*

σ → σ*

a large mass on a weak spring

a flashlight through a prism and shake it

a class of spectroscopic techniques which analyzes molecular motions

an Infrared spectroscopy

Because the energy required to induce a rotational transition is so small that it cannot be measured

Because, in liquids and solids, spectral lines corresponding to rotational transitions are broadened as the result of molecular collisions and other interactions

Because rotational transitions are extremely rare

All of these