The Electron Density in Copper Is 8

question 31

Multiple Choice

The electron density in copper is 8.49 *1028 electrons/m3.The electron charge is e = -1.60 *10-19 C.When a 1.00 A current is present in a copper wire with a 0.40 cm2 cross-section, the electron drift velocity, in m/s, with direction defined relative to the current density, is:

• A)(-1.84 *10-6.)
• B)+1.84 * 10-6.
• C)(-1.84.)
• D)(-5.43 * 105.)
• E)+5.43 * 105.

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Definitions:

Thomas Malthus

An English economist and demographer known for his theory that population growth would outstrip food supply, leading to poverty and famine.

Birthrates

Birthrates measure the number of live births per thousand people in a population over a specific period, reflecting the rate at which a population is growing.

Living Standards

Indicate the wealth, comfort, material goods, and necessities available to an individual or society.

Per Capita Energy Use

The average amount of energy consumed per person within a given geographic area.