Which units would not be appropriate for describing a rotational acceleration?

What is created when solids,liquids,an gases mix with one another

Which branches of natural science include the study of an organism that lived 10 million years ago

Hydrogen atoms are excited by a laser to the =4n=4 state and then allowed to emit. what is the maximum number of distinct emission spectral lines (lines of different wavelengths) that can be observed from this system? 8 6 2 7 4 5 1 3 calculate the wavelength of the 4⟶14⟶1 transition. =λ=