A cell phone battery uses chemistry to create a charge separation between the terminals (anode and cathode). Such a battery is listed as having a capacity of Q = 7.5  × 10–8 C.   (a)  If this charge separation consisted entirely of free electrons, how many free electrons would be present in the battery? (b)  If the operation of the cellphone requires that 1.1 × 106 electrons move through the circuit every second, how long will a full charge of the battery last in seconds?

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Q: Calculate the shortest wavelength of light emitted by the hydrogen atom.

A: Wavelength

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Q: An electronic flashgun has a capacitor with capacitance CC that is charged to a voltage VV. Answer…

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Combination of Capacitors

The connection of capacitors can be established in a circuit in two ways.