${10^{ - 9}}{\rm{\;s\;of\;Cs}} - {\rm{clock\;of\;}}9192631770{\rm{\;oscillations\;}}$

${10^{ - 9}}{\rm{\;s\;of\;Kr}} - {\rm{clock\;of\;}}1650763.73{\rm{\;oscillations\;}}$

${10^{ - 9}}{\rm{\;s\;of\;Kr}} - {\rm{clock\;of\;}}6521389.63{\rm{\;oscillations\;}}$

${10^{ - 9}}{\rm{\;s\;of\;Cs}} - {\rm{clock\;of\;}}1650763.73{\rm{\;oscillations\;}}$

JEE PHYSICS MCQ: UNITS & MEASUREMENTS

1 Medium

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Ins is defined as

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Correct option: D

{10^{ - 9}}\mathrm{\;s\;of\;Cs} - \mathrm{clock\;of\;}9192631770\mathrm{\;oscillations\;}

Option D (

{10^{ - 9}}\mathrm{\;s\;of\;Cs} - \mathrm{clock\;of\;}9192631770\mathrm{\;oscillations\;}

) is correct because it accurately defines a nanosecond based on Cesium-133 oscillations.

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