For a light source that radiates outward, the area it covers can be modelled as a sphere. Therefore, the equation can be modified by using the surface area of a sphere (`A = 4 \pi r^2`):

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The following diagram will help you visualise the equation above. As the distance from the source of light increases, the light energy is spread over an increasing area, resulting in a decreasing intensity. Inverse square law for intensity not only applies to light but other electromagnetic waves such as radio waves.

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A light bulb produces 100 J of energy every 5 seconds. What is the intensity of light measured at 6 m from the light bulb?

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The high intensity discharged bulb burns extremely hot. Regular nighttime usage does not allow algae, barnacles and other marine organisms to attach themselves to the bulb. No one wants to clean their underwater fishing light….so not only does this all but eliminate the necessity to clean the bulb, it allows more time for you to enjoy it.  Each light kit plugs into a 120-volt AC outlet and is equipped with a GFCI plug for additional safety. The dusk to dawn photocell provides accurate control and does not allow power to the control box during daylight hours, giving the owner hassle free operation each night. Because your light powers on and off automatically, it establishes a pattern for bait fish, which ultimately attracts larger fish to your location. Fish have two main goals in life: first is to eat and second is to reproduce. If you take care of their first goal, they will take care of the rest. In addition to attracting trophy gamefish, The Green Monster Fishing Light delivers countless hours of family entertainment for kids and adults.  Coming home late from a day on the water?  The Green Monster Fishing Light will be waiting to guide you safely into your dock slip or boathouse and provides excellent visibility as you offload.

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noun intellectual or spiritual enlightenment. Synonyms: wisdom, insight, revelation, knowledge a supply of light: a source of illumination.

Light carries energy. When it falls upon a surface, this energy is transferred to that surface. The greater the intensity of light hitting the surface, the more energy is transferred to that surface in a given time.

The inverse square law is a principle that states that the intensity of light radiating from a point source diminishes with the square of the distance from the source. This means, if you double the distance from the light source, the intensity becomes a quarter of its initial value.

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If the power of the light source remains constant, that is if the rate of energy transfer remains unchanged, the following expression is true:

This type of lighting is achieved by using lighting fixtures with diffusers or lenses that scatter the light, or by covering the light source with a material ...

The intensity of a radio signal is 0.120 W m–2 at 16 m from a small transmitter. What is the intensity of the signal 4.0 m from the transmitter?

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In basic terms, the intensity of light at a point refers to the power of the light (in watts) arriving per unit area (typically in square meters) at that point. It quantifies how much energy from the light source strikes the surface each second.