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(B) The intensity $I$ of a point source at a distance $r$ is given by the formula $I = \frac{P}{4\pi r^2}$, where $P$ is the power of the source.Since

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$I_o$

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(B) The intensity $I$ of a point source at a distance $r$ is given by the formula $I = \frac{P}{4\pi r^2}$, where $P$ is the power of the source.Since the detector is shifted to another location on the same spherical surface of radius $L$, the distance $r$ from the source remains constant $(r = L)$.Because the intensity $I$ depends only on the distance $r$ for an isotropic point source, the intensity at the new location remains the same as the initial intensity $I_o$.Therefore, the measured intensity at the new location is $I_o$.

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