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Uncertainty in frequency of laser is 2000 Hz.Uncertainty in its periodic time will be…….

Answer»

`5xx10^(-31)S`
`10^(-16)S`
`8xx10^(-5)S`
`10^(-24)S`

SOLUTION :`DeltaE.DeltaT=(h)/(2PI)`
Now E=hf`therefore DeltaE=hDeltaf`
`therefore hDeltaf=(h)/(2piDeltaT)`
`therefore T=(h)/(2pihDeltaf)=(1)/(2piDeltaf)`
`therefore DeltaT=(1)/(2xx3.14xx2000)=0.079xx10^(-3)`
`therefore DeltaT~~7.9xx10^(-5)s=8xx10^(-5)S`


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