Question
What is a voltmeter? How can a galvanometer be converted into a voltmeter of given range? Explain.
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The average energy density of the wave is given
The time averaged intensity of the wave is given $\text{I}_\text{av}=\frac{1}{2}\text{c}\in_0\text{E}_0^2$.

| t(h) | 0 | 1 | 2 | 3 | 4 |
| R(MBq) | 100 | 35.36 | 12.51 | 4.42 | 1.56 |