Question

What is the error in a reproduction of wavelength standard?

(a) 1 part in 100 million

(b) 2 parts in 50 million

(c) 2 parts in 50 million

(d) 1 part in 50 million

This question was addressed to me during an internship interview.

The query is from Wavelength Standard in chapter Standards of Measurements of Engineering Metrology

Answer 1

Right answer is (a) 1 part in 100 million

Explanation: Wavelength standard is reproducible and error of reproduction is very less i.e. only 1 part in 100 million.