These ‘particles’ of light are called photons. How high the peaks are determines what we perceive as the brightness of light. This means the light waves that make up violets, indigo and blue have higher energy levels than the yellow, orange and red. As a light wave's length increases, its energy decreases. LIGHT WAVES. The length of the light wave determines hue or color. You can also fine-tune the brightness of the display, to compensate for a very bright window, for instance. We can reasonably model a 75 W incandescent light bulb as a sphere 6.0 cm in diameter. Higher energy light isn't brighter though. It brightens when there's lots of light, then dims so it's less intrusive when the room darkens. A lumen measures the amount of light that comes from a bulb, also known as light bulb brightness. Color of the light ii. Photoelectric effect. Brightness is purely due to the amount of photons entering your eye. Simply take your current incandescent watts and select the corresponding LED bulb equivalent on the lumens brightness scale. Typically, the higher the wattage, the higher the lumens, and the more light output. A beam of light hits a sheet of metal. Bohr's model of hydrogen. Photoelectric effect. a) In the wave picture of light, what determines the following properties? What does purity or the number of distinct wavelengths determine? Refer to this diagram: In very simple terms it’s how intense it oscillates ‘up and down’. Brightness/intensity of the light iii. Bohr model radii (derivation using physics) (a) What is the . Color of the light ii. b) In the photon picture of light, what determines the following properties? Red light has less energy than blue light because its wavelength is longer. This feature improves visibility of the display. i. The photoelectric effect cannot be explained by considering light as a wave. Pay close attention to lumens, since this number indicates the brightness, or light output, of the bulb. As shows, the electromagnetic spectrum encompasses all of the electromagnetic radiation that occurs in our environment and includes gamma rays, x-rays, ultraviolet light, visible light, infrared light, microwaves, and radio waves. Study the scenario. This is the currently selected item. Introduction to light. The frequency and wavelength determine the colour and energy of light and EMR, the word you need to describe brightness is amplitude. science. It determines saturation. What does the intensity or amplitude of a light wave determine? Brightness/intensity of the light iii. The Wave® radio display automatically adjusts to the light conditions in the room. Brightness, in physics, the subjective visual sensation related to the intensity of light emanating from a surface or from a point source (see luminous The visible spectrum is the portion of the larger electromagnetic spectrum that we can see. Light: Electromagnetic waves, the electromagnetic spectrum and photons. Typically, only about 5% of the energy goes to visible light; the rest goes largely to non-visible light infrared radiation. Each photon has a specific amount of energy that is determined by its wavelength or frequency. i. Energy of the light. Energy of the light Many objects contain atoms capable of either selectively absorbing, reflecting or transmitting one or more frequencies of light. Spectroscopy: Interaction of light and matter. The colors perceived of objects are the results of interactions between the various frequencies of visible light waves and the atoms of the materials that objects are made of. 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