Answer:
Brackett Series (n = 4)
Explanation:
The least energetic line of Hydrogen atom lies in <em>Brackett Series </em>when n = 4 because these are least energetic, have longer wavelengths and lies in Infrared region of spectrum. No traces of <em>Pfund series </em>are formed by H=atoms.
Kelvin (K) is the only scale that has a numeral value assigned to absolute zero.
A should be the correct answer because any argument based on science makes a result more logical.
Because they can't get trapped in.