Halogen lightbulbs allow their filaments to operate at a higher temperature than the filaments in standard incandescent bulbs. for comparison, the filament in a standard lightbulb operates at about 2900k, whereas the filament in a halogen bulb may operate at 3400k. which bulb has the higher peak frequency? calculate the ratio of the peak frequencies. the human eye is most sensitive to a frequency around 5.5x10^14 hz. which bulb produces a peak frequency close to this value?

Hydroelectricity provides about 7 percent of the electricity generated in the united states. (a) explain how a hydroelectric power plant converts energy stored in water into electricity. (b) identify two factors that determine the amount of electricity that can be generated by an individual hydroelectricity power plant. (c) describe the two main types of land-based hydroelectric power plants. (d) describe two economic advantages and two environmental disadvantages of hydroelectricity.