Excitation of vibrational motion of molecules is associated with which region of the electromagnetic spectrum? Group of answer choices X-ray infrared microwave visible ultraviolet

The second member of Balmer series of hydrogen atom has wavelength of $4861\times {10}^{-10}$ m. Calculate the wavelength of third member of Balmer series

If a black body is radiating at ${17}^{\circ }$ C. Calculate the (a) wave length at which maximum energy will be radiated and (b) energy per unit area per second radiated by this black body.

Do someone knows the units of the spectra provided here ? It seems obvious enough that it's said nowhere, but even Wikipedia and other sites are quite blurry on this point.
So, is it power (W), radiance($\mathrm{W}/{\mathrm{m}}^2\mathrm{s}\mathrm{r}$), or something else ?

How much does the gravitational redshift change a neutron star emission spectra disturbing so the measurement of its surface temperature?

What is wavelength in the Balmer series of hydrogen corresponding to the transition fron n=4 to n=2

Find the approximate temperature of a red star that emits light with a wavelength of maximum emission of 700 nm

For the hydrogen atom, the Balmer Series is the series of line spectra produced when an election falls from any higher energy level and has n=2 as its final energy state. The longest wavelength is the Balmer Series is 656.7 nm. what was the initial principal energy level (n) associated with this photon