What kind of measurement that can require accuracy to billionths?

Answer 1

Measurements requiring accuracy to billionths, or nanometer precision, are often found in fields such as semiconductor manufacturing, where the dimensions of microchips need to be precisely controlled to ensure functionality. Similarly, in atomic and molecular physics, measurements of atomic distances and energy levels may also demand such high precision. Additionally, advanced materials science and Nanotechnology often require measurements at this scale to understand and manipulate materials at the atomic level.