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A manufacturer of light bulbs advertises that its 55-W bulb, which produces 800.0 lm of light output, gives almost the similar light as a 60.0-W bulb with an energy savings.
The 60.0-W bulb produces 840.0 lm.
a. Which bulb most efficiently changes electric energy to light?
Given the ratio of velocities of two light waves traveled in vacuum and having wave lengths 5000A o and 6000A o . Can you explain by working of diamonds sparkle?
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what is measurement
Cutting a glass dish from a used electric bulb The hemispherical bottom of an electric light bulb gives a useful glass dish; a soldering iron can be used to cut it off. put the
Use Thévenin's theorem to find the current ?owing in the 14Ω resistor of the network shown in Figure. Find also the power dissipated in the 14Ω resistor.
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