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# Intensity Question Watch

1. Intensity question
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2. (Original post by be patient)
Intensity question

Could you also not just post the question with no comment or text.
You need to show what you have attempted and say where you are stuck or what you don't understand.

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I've started a new thread for you for this question.
3. At a distance of 1.0 m from the source, the energy is spread over a sphere of radius 1.0 m. How much area is this? You should now be able to use the definition of intensity to work out what it is at this point.
4. 4pi*1²? I'm pretty sure that I'm wrong
5. No, that's right, the 100 J of energy produced every second is spread out over a sphere of surface area 4 pi square metres. So, using the definition of intensity, how much of this falls on an area of one square metre?
6. So it will be 100/4pi*1²=7.95 what about if it's not a sphere some other shape or surface area coverage, how would k know?
7. It would depend on the particular question. You may have to reason it out depending on what you are asked. But you will not be set a question that will be beyond your ability to do this.

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