A Geiger counter registers a count rate of 8,000 counts per minute from a sample of a radioisotope. The count rate 24 minutes later is 1,000 counts per minute. The half life of the radioisotope is 8 minutes.
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[Ques. 2] The half life of uranium-232 is 70 years. The time for 3/4 of a sample of uranium-232 to decay is 105 years.
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[Ques. 3] If one waits for a time equal to two half-lives for a certain radioactive material, all of it originally present will have decayed completely.A
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[Ques. 4] The time interval during which a nucleus has a 50 probability of decaying is its half life.
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[Ques. 5] The number of protons in a nucleus equals the number of neutrons.
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[Ques. 6] When a nucleus in an excited state decays to the ground state, a beta particle is emitted.
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[Ques. 7] When a neutron decays to a proton, a beta particle is emitted.
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[Ques. 8] When sulfur-35 (Z = 16) decays to chlorine-35 (Z = 17), an alpha particle is emitted.
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[Ques. 9] When radium-223 (Z = 88) decays to radon-119 (Z = 86), an alpha particle is emitted.
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[Ques. 10] Alpha, beta, and gamma particles are all deflected by a magnetic field.
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