Which is not a way to minimize your exposure to radiation? a) wearing a lead apron b) keeping a good distance c) standing behind a thick concrete wall d) wearing lead-lined gloves e) staying a longer time

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=