The region in the electromagnetic spectrum where the Lyman series lines appear is 

The Lyman series is a set of spectral lines in the hydrogen atom spectrum. These lines are formed when an electron transitions from a higher energy level (n > 1) to the first energy level (n = 1) within the hydrogen atom. The energies associated with these transitions correspond to the ultraviolet (UV) region of the electromagnetic spectrum. Hence, when asked "Lyman series lies in which region," the answer is unequivocally the UV region.

Explanation

The Lyman series lies in which region can be determined based on the wavelength of the emitted radiation during the electron transitions. These transitions release photons with high energy and shorter wavelengths, which are characteristic of the ultraviolet spectrum. The formula for the wavelengths of the Lyman series is given by the Rydberg equation:

1/λ = R_H (1/1² - 1/n²), where:

• λ is the wavelength of the emitted light.
• R_H is the Rydberg constant.
• n is the principal quantum number (n > 1).

Conclusion

To summarize, the answer to the query "Lyman series lies in which region" is that the Lyman series belongs to the ultraviolet (UV) region of the electromagnetic spectrum. These lines are critical in understanding atomic transitions and have applications in both spectroscopy and astrophysics.