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## Homework Statement:

- Power source of radiation

## Relevant Equations:

- Is my solution correct?

Hallo, can anybody help me and check if i have the right result:

What is the minimum power P that a point source of radiation (I=8*10^(-7) W/m^2) at a distance of l=10 m from the listener must have in order to still be perceived? (Note: The emitted energy per area can be related to a spherical body with A=4 π r^2)

P=I*A

P=8*10^-7 (W/m^2)*4*pi *(10m)^2= 0,001 Watt

What is the minimum power P that a point source of radiation (I=8*10^(-7) W/m^2) at a distance of l=10 m from the listener must have in order to still be perceived? (Note: The emitted energy per area can be related to a spherical body with A=4 π r^2)

P=I*A

P=8*10^-7 (W/m^2)*4*pi *(10m)^2= 0,001 Watt