Final answer:
In the visible emission spectrum of hydrogen, spectral lines at 656 nm, 486 nm, 434 nm, and 410 nm, corresponding to transitions to the second orbit, would be observed between 100 nm and the upper limit of the visible spectrum.
Step-by-step explanation:
The emission spectrum of a hydrogen atom is characterized by a series of spectral lines known as the Balmer series, which occur when electrons transition from higher-energy orbits (n > 2) to the second orbit (n = 2). Visible spectral lines include those at 656 nm (red), 486 nm (aqua), 434 nm (blue), and 410 nm (violet). In the range between 100 nm and a specified upper limit, only these spectral lines will be seen as they fall within the visible spectrum. Since the question is incomplete without the upper limit, we presume it to refer to a range that includes at least the violet line at 410 nm, but does not extend into the ultraviolet (UV), where more lines would exist but would remain invisible to the human eye.