A line in the Brackett series of hydrogen has a wavelength of 1945 nm. From what state did the electron originate?

i=
In which region of the electromagnetic spectrum is this line observed?

radio

visible

ultraviolet

X‑rays

infrared

gamma rays

microwaves

Subduction zones occur on earth where dense oceanic crust dives under more buoyant continental crust. these boundaries are characterized by a deep ocean trench next to a high continental mountain range, large numbers of earthquakes and volcanoes. all of this is further evidence for the a) big bang theory b) origin of the species eliminate c theory of plate tectonics d theory of natural selection 4 sedimentary rocks found high in the himalayen mountain

Fill in the coefficients that will balance the following reaction: a0cr2(so4)3 + a1agno3

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