The density of ethyl alcohol is 0.789 g/ ml. If the mass of ethyl alcohol is 157.8 g, calculate the volume needed to fill the container?

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Ответ:

kimmy6973

15.11.2021

Physics

Intensity at 45 cm will be 0.2283 volt

Explanation:

We have given that intensity of signal measured by the detector is 0.74 volt at a distance of 25 cm

We know that intensity of signal is given by $I=\frac{s}{r^2}$ , here s is strength of light and r is distance

So $0.74=\frac{s}{{25}^2}$

s=462.5

In second case

Intensity is given by $I=\frac{s}{r^2}$

So $I=\frac{462.5}{45^2}=0.2283volt$

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