Physics: Principles with Applications
6th Edition
ISBN: 9780130606204
Author: Douglas C. Giancoli
Publisher: Prentice Hall
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Question
Chapter 27, Problem 7Q
To determine
Usage of photoelectric circuit in burglar alarm, a smoke detector and in photographic light meter.
Expert Solution & Answer
Explanation of Solution
(a)A burglar alarm:
The alarm consist of a photoelectric cell connected in a closed electrical circuit and an infrared source of light. The light from the infra red source is continuously incident on the photoelectric cell, maintaining a constant current in the circuit. The device is kept conceated near the place to be protected.
If a burglar intercepts the invisible infrared rays, the photoelectric current stops. This automatically operates a relay,which sends an
(b)A smoke Detector:
A light beam could be focused on a photocell. When the light beam is interrupted by a smoke as it become denser and denser (thicker)then the current in the (thicker)circuit would decrease or stop. An alarm could be set to go off when the current decreased below a certain level.
Many smoke detectors use the
(c)Photographic light meter:
The amount of current in the circuit depends on the intensity of light, as long as the
Chapter 27 Solutions
Physics: Principles with Applications
Ch. 27 - Prob. 1QCh. 27 - Prob. 2QCh. 27 - Prob. 3QCh. 27 - Prob. 4QCh. 27 - Prob. 5QCh. 27 - Prob. 6QCh. 27 - Prob. 7QCh. 27 - Prob. 8QCh. 27 - Prob. 9QCh. 27 - Prob. 10Q
Ch. 27 - Prob. 11QCh. 27 - Prob. 12QCh. 27 - Prob. 13QCh. 27 - Prob. 14QCh. 27 - Prob. 15QCh. 27 - Prob. 16QCh. 27 - Prob. 17QCh. 27 - Prob. 18QCh. 27 - Prob. 19QCh. 27 - Prob. 20QCh. 27 - Prob. 21QCh. 27 - Prob. 22QCh. 27 - Prob. 23QCh. 27 - Prob. 24QCh. 27 - Prob. 25QCh. 27 - Prob. 26QCh. 27 - Prob. 27QCh. 27 - Prob. 28QCh. 27 - Prob. 1PCh. 27 - Prob. 2PCh. 27 - Prob. 3PCh. 27 - Prob. 4PCh. 27 - Prob. 5PCh. 27 - Prob. 6PCh. 27 - Prob. 7PCh. 27 - Prob. 8PCh. 27 - Prob. 9PCh. 27 - Prob. 10PCh. 27 - Prob. 11PCh. 27 - Prob. 12PCh. 27 - Prob. 13PCh. 27 - Prob. 14PCh. 27 - Prob. 15PCh. 27 - Prob. 16PCh. 27 - Prob. 17PCh. 27 - Prob. 18PCh. 27 - Prob. 19PCh. 27 - Prob. 20PCh. 27 - Prob. 21PCh. 27 - Prob. 22PCh. 27 - Prob. 23PCh. 27 - Prob. 24PCh. 27 - Prob. 25PCh. 27 - Prob. 26PCh. 27 - Prob. 27PCh. 27 - Prob. 28PCh. 27 - Prob. 29PCh. 27 - Prob. 30PCh. 27 - Prob. 31PCh. 27 - Prob. 32PCh. 27 - Prob. 33PCh. 27 - Prob. 34PCh. 27 - Prob. 35PCh. 27 - Prob. 36PCh. 27 - Prob. 37PCh. 27 - Prob. 38PCh. 27 - Prob. 39PCh. 27 - Prob. 40PCh. 27 - Prob. 41PCh. 27 - Prob. 42PCh. 27 - Prob. 43PCh. 27 - Prob. 44PCh. 27 - Prob. 45PCh. 27 - Prob. 46PCh. 27 - Prob. 47PCh. 27 - Prob. 48PCh. 27 - Prob. 49PCh. 27 - Prob. 50PCh. 27 - Prob. 51PCh. 27 - Prob. 52PCh. 27 - Prob. 53PCh. 27 - Prob. 54PCh. 27 - Prob. 55PCh. 27 - Prob. 56PCh. 27 - Prob. 57PCh. 27 - Prob. 58PCh. 27 - Prob. 59PCh. 27 - Prob. 60PCh. 27 - Prob. 61PCh. 27 - Prob. 62PCh. 27 - Prob. 63PCh. 27 - Prob. 64GPCh. 27 - Prob. 65GPCh. 27 - Prob. 66GPCh. 27 - Prob. 67GPCh. 27 - Prob. 68GPCh. 27 - Prob. 69GPCh. 27 - Prob. 70GPCh. 27 - Prob. 71GPCh. 27 - Prob. 72GPCh. 27 - Prob. 73GPCh. 27 - Prob. 74GPCh. 27 - Prob. 75GPCh. 27 - Prob. 76GPCh. 27 - Prob. 77GPCh. 27 - Prob. 78GPCh. 27 - Prob. 79GPCh. 27 - Prob. 80GPCh. 27 - Prob. 81GPCh. 27 - Prob. 82GPCh. 27 - Prob. 83GPCh. 27 - Prob. 84GPCh. 27 - Prob. 85GPCh. 27 - Prob. 86GPCh. 27 - Prob. 87GP
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