What is the number of neutrons in the nucleus of the atom used to produce laser radiations?

• A. 48
• B. 49
• C. 50
• D. 51

Answer: (C)

To determine the number of neutrons in the nucleus of the atom used to produce laser radiation, it is important to understand the specific characteristics and atomic structure of the element in question, commonly referred to in the context of lasers.

One of the most widely used atoms for laser applications is Gallium arsenide (GaAs), which is made up of gallium (Ga) and arsenic (As). In these types of discussions, the focus on atomic mass and atomic number is crucial. For example, Gallium has an atomic number of 31, meaning it has 31 protons. To find the number of neutrons in a common isotope, one takes the atomic mass (approximately 69 or 71) and subtracts the atomic number. For instance, in the case of the isotope Gallium-69:

• Atomic mass = 69

• Atomic number (protons) = 31

• Neutrons = Atomic mass - Atomic number = 69 - 31 = 38.

However, if we expand beyond gallium to other elements typically used in lasers, Neodymium (Nd) often comes up, and its relevant isotopes can account for laser production as well. Neodymium-144 has 60