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यह दावा किया जाता है कि यदि बिना किसी बाधा के 100 वर्षो तक दो सीजियम घड़ियों को चलने दिया जाये , तो उनके समयों में केवल 0.02 s का अन्तर हो सकता है मानक सीजियम घडी द्वारा 1S के समय अंतराल को मापने में यथार्थता के लिए इसका क्या अभिप्राय है ?

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कुल समय (t ) = 100 yr
`=100 xx 365(1)/(4)` days
`=100xx 365(1)/(4) xx 24h`
`=100 xx 365 (1)/(4)xx24xx60xx60s`
समय में अन्तर `(Delta t) = 0.02s `
1 s में त्रुटि `=( 0.02)/(100xx365(1)/(4) xx24xx60xx60)`
`=(2xx10^(-2) xx4)/(1461xx24xx36xx10^(4))`
`=6.34xx10^(-12)s`
`=10^(-12)s `
अंत : सीजियम घड़ी द्वारा 1 s समय अंतराल के मापन में यथर्थता `10 ^(-12 )` s है ।

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