H2P-277
Inverse square law
H2 Physics · JC 1 · Easy · Inverse square law
A point source of light emits waves equally in all directions. At a distance of 2.0 m from the source, the intensity is measured to be 4.0 W m⁻². What is the intensity at a distance of 6.0 m from the source?
(Take the waves to spread spherically so that intensity varies with the inverse square of distance.)
(Take the waves to spread spherically so that intensity varies with the inverse square of distance.)
- 0.44 W m⁻²
- 0.22 W m⁻²
- 1.3 W m⁻²
- 12 W m⁻²
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