Radius of the circular surface, r = 4 cm = 0.What is the intensity of light incident normal to a circular surface of radius 4 cm from a 200 W source of light? Ans. Area of the cross-section, A = 20 ×10 6 m 2.Power of the wave, P = 20 KW = 20 ×10 3 W.Calculate the intensity of a wave whose power is 20 KW, and the area of cross-section is 20 x 10 6 m 2. A surface is the surface area of the sphere.I is the intensity at the sphere’s surface.When a uniform intensity, |I| = constant, is integrated across a surface perpendicular to the intensity vector, such as a sphere centered around the point source, the equation becomes dA is a small element of a closed surface that contains the source.This is an example of the inverse-square law.įrom the law of conservation of energy, considering the net power emanating is constant, If a point source emits energy in all directions (creating a spherical wave), and no energy is absorbed or scattered by the medium, the intensity decreases proportional to the distance from the object squared. The minimum intensity of sound that a human can hear is 10 -12 W m -2 and the maximum is 1 W m -2.It is also known as Acoustic Intensity.Sound Intensity can be calculated as the power carried by the sound waves per unit area in the direction perpendicular to that area.Luminous Intensity or Light Intensity is the amount of visible light emitted from the source/ brightness of light from the source per unit distance.The magnitude of intensity will depend on the strength and amplitude of a wave under propagation.The intensity of a wave is the quantity of energy that the wave conveys per unit time across the surface of the unit area, and it is also equivalent to the energy density multiplied by the wave speed. The dimensional formula of intensity is.The SI unit of intensity is watts per square meter (W/m 2), or kg s −3 in base units.Intensity in Physics Definition & Formula Electromagnetic Waves. photosynthesis, the process by which green plants and certain other organisms transform light energy into chemical energy.During photosynthesis in green plants, light energy is captured and used to convert water, carbon dioxide, and minerals into oxygen and energy-rich organic compounds. Then it transitions to blue until 670 THz, or 450 nm. The area is measured on a plane perpendicular to the direction of energy propagation. Green light comes after yellow, and it spans up to 610 THz, or 490 nm.The power transferred per unit area is known as the intensity or flux of radiant energy.
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