A tungsten wire in a vacuum has length 26.0 cm and radius 6.00 mm. A potential difference is applied across it. (a) What is the resistance of the wire at 293 K? (b) Suppose the wire reaches an equilibrium temperature such that it emits 70.0 W in the form of radiation. Neglecting absorption of any radiation from its environment, what is the temperature of the wire? (Note: e = 0.320 for tungsten.) K (c) What is the resistance of the wire at the temperature found in part (b)? Assume the temperature changes linearly over this temperature range. Ω (d) What voltage drop is required across the wire? V

A tungsten wire in a vacuum has length 26.0 cm and radius 6.00 mm. A potential difference is applied across it. (a) What is the resistance of the wire at 293 K? (b) Suppose the wire reaches an equilibrium temperature such that it emits 70.0 W in the form of radiation. Neglecting absorption of any radiation from its environment, what is the temperature of the wire? (Note: e = 0.320 for tungsten.) K (c) What is the resistance of the wire at the temperature found in part (b)? Assume the temperature changes linearly over this temperature range. Ω (d) What voltage drop is required across the wire? V

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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Concept explainers

Resistivity

Resistivity is a characteristic property of the conductor’s material that measures the extent to which the material opposes the flow of current. It is denoted by the Greek letter “rho”. Electrical resistivity, also known as specific resistance, depends on the nature of the material of the conductor and is unaffected by its dimensions.

Question

A tungsten wire in a vacuum has length 26.0 cm and radius 6.00 mm. A potential difference is applied across it.
(a) What is the resistance of the wire at 293 K?
Ω
(b) Suppose the wire reaches an equilibrium temperature such that it emits 70.0 W in the form of radiation. Neglecting absorption of any radiation from its environment, what is
the temperature of the wire? (Note: e = 0.320 for tungsten.)
K
(c) What is the resistance of the wire at the temperature found in part (b)? Assume the temperature changes linearly over this temperature range.
Ω.
(d) What voltage drop is required across the wire?
(e) Why are tungsten lightbulbs energetically inefficient as light sources?

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