Worksheet: Radiative Power of Electromagnetic Radiation
In this worksheet, we will practice determining the radiant power received per unit area at a distance from a point source of electromagnetic radiation.
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?
A point source emits electromagnetic radiation with a radiant power of 150 W. What is the irradiance at a point 2.4 m from the source?
Which of the following formulas correctly relates the irradiance of electromagnetic radiation at a point to the distance from its source and the radiant power of the emitted electromagnetic radiation?
A point source emits electromagnetic radiation. The irradiance at a point 3.43 m from the source is 1.75 W/m2. What radiant power does the source emit?
Calculate the total irradiance at the point shown in the diagram due to the point sources of electromagnetic radiation.
At a point , the irradiance due to the electromagnetic radiation emitted from a point source equals , where is the irradiance due to the same source at a point that is 15 cm from the source. How far from the source is ?
A point source emits electromagnetic radiation with a radiant power of 655 W. The irradiance at another point is 8.25 W/m2. What is the distance of the point from the source?