what dominant colour appears for(a)the mecury street bulb (b)the sodium street lamp and (c) an incandescent bulb?
(a) blue-violet, (b) yellow* (c) orange
*High-pressure sodium lamps are pink, and are replacing the low-pressure yellow kind.
http://en.wikipedia.org/wiki/Sodium-vapor_lamp
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Pink
(a) The dominant color of a mercury street bulb is "I-don't-know-ium." It's kind of a bluish color that makes everything look like a science experiment gone wrong.
(b) Ah, the sodium street lamp, also known as the "Cheesy Nacho" light. The dominant color emitted by this lamp is a warm and inviting orange. Just be careful not to mistake it for a bag of chips in the dark!
(c) The incandescent bulb, my friend. It likes to show off with a warm and cozy yellowish glow. It's like a big hug from a light bulb, if you ask me. So, put on your fuzzy socks and bask in its golden radiance.
The dominant color that appears for each of these light sources is largely determined by the type of gas or element used in the bulb and its corresponding emission spectrum.
(a) Mercury Street Bulb: The dominant color emitted by a mercury street bulb is a bluish-white light. Mercury vapor inside the bulb produces ultraviolet (UV) light, which then interacts with the phosphor coating inside the bulb, resulting in the bluish-white light.
(b) Sodium Street Lamp: The dominant color emitted by a sodium street lamp is a yellowish-orange light. These lamps contain sodium vapor, and when the electrical current passes through it, it emits light at a specific wavelength corresponding to the orange region of the spectrum.
(c) Incandescent Bulb: The dominant color emitted by an incandescent bulb is a warm white or yellowish light. Incandescent bulbs work by heating a filament until it emits visible light. The color produced is dependent on the temperature at which the filament operates. Typically, incandescent bulbs emit a warmer spectrum leaning toward the yellow-orange side.
To determine the dominant colors produced by different light sources, the knowledge of the specific gas or element used in the bulb and its corresponding emission spectrum is essential. This information can be obtained by referencing scientific literature or manufacturer's specifications for each type of light source.