What is common to all light sources, including incandescent, fluorescent, neon, halogen, laser, and sodium-vapor devices?
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Unit 3 test
1. D
2. B
3. A
4. B
5. A
6. A
7. B
8. B
9. B
10. D
11. C
12. A
13. B
14. A
15. C
16. A
17. Longitudinal
18. Surface
19. Wavelength
20. Destructive
21. Node
22. Decibel
23. C
24. Transverse
25. Black
26. It will bend
27. X-rays for bones..gamma for brain
28. They all use some type of gas
The source of light (electromagnetic radiation of the visual range) is the transitions of electrons in atoms (from the higher to the lower levels)
a 1.0kg(1000g) block of ice at 0.0c is added to a picnic cooler. How much heat will the ice remove as it melts to water at 0.0c
2. Should be all the above
4. Both A and B
13. Should be A
14. Should be D
Just took the test and missed those
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What is common to all light sources, including incandescent, fluorescent, neon, halogen, laser, and sodium-vapor devices, is that they emit light. Light is a form of electromagnetic radiation that can be perceived by the human eye.
To understand why these light sources emit light, we need to look at the different mechanisms at work in each type. Here's a brief explanation of how each type of light source works:
1. Incandescent bulbs: These bulbs work by passing an electric current through a wire filament, which heats up and emits visible light. The filament becomes so hot that it glows and produces the light.
2. Fluorescent bulbs: These bulbs contain a gas that emits ultraviolet (UV) light when an electric current passes through it. The UV light then strikes a phosphor coating on the inside of the bulb, which converts the UV light into visible light.
3. Neon lights: Neon lights contain tubes filled with low-pressure neon gas. When an electric current is applied, the gas atoms become excited and emit light. The characteristic color of neon lights is due to the specific wavelength of light emitted by neon atoms.
4. Halogen bulbs: Similar to incandescent bulbs, halogen bulbs also use a wire filament. However, they contain halogen gas that helps recycle the evaporated tungsten from the filament back onto the filament, increasing its lifespan and brightness.
5. Laser devices: Laser stands for "Light Amplification by Stimulated Emission of Radiation." Lasers produce a highly focused and coherent beam of light through stimulated emission. This involves exciting atoms or molecules to a higher energy state and causing them to emit light photons that are in phase and align with a specific direction.
6. Sodium-vapor devices: Sodium-vapor lamps work by ionizing sodium gas inside a discharge tube. The excited sodium atoms emit yellow-orange light when the electric current passes through them.
While each type of light source may differ in the specific process through which they emit light, they all share the common characteristic of producing visible light in one form or another.