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Intensity of waves


Niha afzal

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Yes, but brightness is still a vagueish term.

 

The intensity is a measure of the energy of the wave (per uint area or volume) and, as you say it is proportional to the square of the amplitude.

 

So [math]I \propto {A^2}[/math]

 

[math]I = {k_1}{A^2}[/math]

 

and

 

[math]I \propto \frac{1}{{{r^2}}}[/math]

or

 

[math]I = \frac{{{k_2}}}{{{r^2}}}[/math]

Can you now combine these two equations to find the answer?

 

 

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