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1-Light arriving at a solar panel is delivering a power of 1000 W to the solar panel surface. The solar panel has an area of 2 m2. What is the intensity of the light arriving at the surface of the panel?

2- A 200 W speaker is playing at full power. The speaker is at the center of a 1 m radius spherical chamber. What is the total sound power that reaches the walls?

3- Now the speaker is placed inside a 2 m radius spherical chamber and again plays at full power. Now what total sound power reaches the walls?

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