SPECTROSCOPY

None of these

The entrance slit

The diffraction grating

The collimating lens

when the amplitudes are the same.

when the frequencies match exactly

at anytime.

at no time.

n → σ*

none of these

σ → σ*

n → π* and π → π*

an Infrared spectroscopy

a class of spectroscopic techniques which analyzes molecular motions

a flashlight through a prism and shake it

a large mass on a weak spring

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