Question

Which of the following option is correct about wavelength standard?

(a) Wavelength does not depend upon the amount of isotope impurity

(b) Solid state lasers having high intrinsic noise can be used to study new lines

(c) Krypton 86 is produced by neutron bombardment of gold

(d) Cadmium 114 is the secondary international length standard

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I would like to ask this question from Wavelength Standard topic in portion Standards of Measurements of Engineering Metrology

Answer 1

The correct choice is (d) Cadmium 114 is the secondary international length standard

Explanation: Wavelength depends upon the impurity of isotopes. Mercury 198 is produced by neutron bombardment of gold. Cadmium is the only natural material which can produce an almost symmetrical spectral line.