Lesson: Radiative Power of Electromagnetic Radiation High School Physics

A point source of electromagnetic radiation has a radiant power of 225 W. The radiation emitted by the source is all visible light, with wavelengths between 400 nm and 700 nm. Each wavelength emitted has a 1 nm difference in length to its most similar emitted wavelength. All the wavelengths are emitted with the same energy. How much radiant power is emitted at each wavelength?

Three point sources of electromagnetic radiation are at different points on the surface of a sphere centered on the point , as shown in the diagram. The radius of the sphere is 2.5 m. What is the irradiance at the point ?

An object that emits electromagnetic radiation uniformly is at the position , as shown in the diagram. Which of the following statements most correctly describes how the irradiance produced by the radiating object at the points , , and on the surface of a sphere centered at compare to each other?