Answer:
Visible Light Region
Explanation:
The wavelengths of different regions in electromagnetic radiation spectrum are given below:
Radio Waves -------- Greater than 10 mm
Microwaves -------- 10 mm to 0.1 mm
Infrared -------- 100 μm to 740 nm
Visible Light -------- 740 nm to 380 nm
Ultra Violet -------- 380 nm to 10 nm
X-rays -------- 10 nm to 100 pm
Gamma Rays ------- less than 100 pm
Since, the wavelength of the fifth line has a wavelength of 397 nm. Therefore, it is clear from the given information above, that this wavelength lies within the range of Visible Light.
Hence, the fifth line of Balmer Series occur in the Visible Light Region of the electromagnetic spectrum.