Chapter 4: Q21E (page 1074)
he intensity of a cylindrical laser beam is
Short Answer
a. The average power output of the lase is
b. The
Chapter 4: Q21E (page 1074)
he intensity of a cylindrical laser beam is
a. The average power output of the lase is
b. The
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The text states that good thermal conductors are also good electrical conductors. If so, why donโt the cords used to connect toasters, irons, and similar heat-producing appliances get hot by conduction of heat from the heating element?
Copper has
length of 12-gauge copper wire that is 2.05 mm in diameter carries 4.85 A of
current. (a) How much time does it take for an electron to travel the length
of the wire? (b) Repeat part (a) for 6-gauge copper wire (diameter 4.12 mm)
of the same length that carries the same current. (c) Generally speaking,
how does changing the diameter of a wire that carries a given amount of
current affect the drift velocity of the electrons in the wire?
(See Discussion Question Q25.14.) Will a light bulb glow more brightly when it is connected to a battery as shown in Fig. Q25.16a, in which an ideal ammeter is placed in the circuit, or when it is connected as shown in Fig. 25.16b, in which an ideal voltmeter V is placed in the circuit? Explain your reasoning.
BIO The average bulk resistivity of the human body (apart from surface resistance of the skin) is about
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