One is to move your hand farther in the same amount of time, increasing the amplitude (tallness) of the wave (which is like the brightness of the light). Dependent variable (1pt): Brightness off the light bulb (lumens) Predicted Relationship (1pt): Direct relationship Control Case (1pt): Voltage of 0v. If you move your hand back and forth, that back and forth motion will travel along the string as a wave. Visible light, radio waves, x-rays and other types of radiation are all part of the electromagnetic spectrum. The brightness depends on the square of the current and is directionally proportional to the power. It can't be objectively measured, but it can be scaled, so that the same viewer (or viewers with similar perceptions) can … This led to a no brightness Background In this lab, we tested the relation between the voltage of a circuit and how it affects the brightness … ! It depends on the perception of whoever is viewing the light. In an image, intensity of a pixel is defined as the value of the pixel. Double the current and you have 4 times the brightness! As light rays emerge from a source, they spread out in an area. The result, as observed, will be a clear reduction in overall brightness within the tube. In MKS, it is measured in units of {\rm J\ s}^{-1}\ {\rm m}^{-2}\ {\rm Hz}^{-1}\ {\rm ster}^{-1}. It depends on the perception of whoever is viewing the light. According to the Inverse Square Law of brightness, the Apparent Brightness (B) of a source is inversely proportional to the square of its distance (d). Luminosity and brightness Luminosity. Emittance is a property of a charged particle beam in a particle accelerator.It is a measure for the average spread of particle coordinates in position-and-momentum phase space and has the dimension of length (e.g., meters) or length times angle (meters times radians). For example in an 8 bit grayscale image there are 256 gray levels. Hence, there is a greater or wider area for the light to illuminate. When the radius of the tube increases, the area of space inside the tube will also increase. The brightness B_\nu (more properly known as the specific brightness) is the intensity of a radiating source (i.e., the energy flux per solid angle per unit of frequency), also called the radiance or surface brightness. Visible light is electromagnetic radiation with wavelengths ranging from roughly 400 and 700 nanometers. The Apparent Brightness of a source is a consequence of geometry. There are two ways of putting more energy into this. Why Do We Not List Black and White as Colors in Physics?. They may not, however, experience the same current.Therefore, when you are asked to rank the brightness of identical bulbs, you are really being asked to rank the amount of current through each. The brightness of a lightbulb is given by its power.P = I 2 R, and so brightness depends on current and resistance. 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