A Light Source Radiates $60.0 \mathrm {~W}$ Of Single-Wavelength Sinusoidal Light Uniformly in All Directions

Multiple Choice

A light source radiates $60.0 \mathrm {~W}$ of single-wavelength sinusoidal light uniformly in all directions. What is the average intensity of the light from this bulb at a distance of $0.400 \mathrm {~m}$ from the bulb?

A) $11.9 \mathrm {~W} / \mathrm { m } ^ { 2 }$
B) $29.8 \mathrm {~W} / \mathrm { m } ^ { 2 }$
C) $27.4 \mathrm {~W} / \mathrm { m } ^ { 2 }$
D) $14.9 \mathrm {~W} / \mathrm { m } ^ { 2 }$
E) $37.2 \mathrm {~W} / \mathrm { m } ^ { 2 }$