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2. a) What is radioactivity? b) A point source of gamma radiation has a half life of 45.0 minutes. A Geiger counter placed 3.00 m from the source registers an initial count rate of 7.20 x 10 counts per second. The counter is immediately moved to a new position and lef there. If after 3.00 hours, the count rate recorded is exactly 5.00 counts per second, how far is the counter from the source?

2. a) What is radioactivity? b) A point source of gamma radiation has a half life of 45.0 minutes. A Geiger counter placed 3.00 m from the source registers an initial count rate of 7.20 x 10 counts per second. The counter is immediately moved to a new position and lef there. If after 3.00 hours, the count rate recorded is exactly 5.00 counts per second, how far is the counter from the source?

Applications and Investigations in Earth Science (9th Edition)
Applications and Investigations in Earth Science (9th Edition)
9th Edition
ISBN:9780134746241
Author:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Publisher:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Chapter1: The Study Of Minerals
Section: Chapter Questions
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2. a) What is radioactivity?of c b) A point source of gamma radiation has a half life of 45.0 minutes. A Geiger counter placed 3.00 m from the source registers an initial count rate of 7.20 x 10 counts per second. The counter is t immediately moved to a new position and left there. If after 3.00 hours, the count rate recorded is exactly 5.00 counts per second, how far is the counter from the source?
Transcribed Image Text:2. a) What is radioactivity?of c b) A point source of gamma radiation has a half life of 45.0 minutes. A Geiger counter placed 3.00 m from the source registers an initial count rate of 7.20 x 10 counts per second. The counter is t immediately moved to a new position and left there. If after 3.00 hours, the count rate recorded is exactly 5.00 counts per second, how far is the counter from the source?
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