How is statement a correct???

Dear student

There is another form of Heisenberg’s uncertainty principle for simultaneous measurements of energy and time.
In equation form,

$\Delta E\Delta t\ge \frac{h}{4\pi },$

where $\Delta E$ is the uncertainty in energy and $\Delta t$ is the uncertainty in time.
This means that within a time interval $\Delta t$ , it is not possible to measure energy precisely and there will be an uncertainty $\Delta E$ in the measurement.
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