Unit Test — Unit test Answers
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cobalturaniumcarbontechnetium
A
cobaltB
uraniumC
carbonD
technetium22
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The half-life of iodine-131 is 8 days. Chan Hee examines two samples of iodine-131.Sample 1: 10 gSample 2: 20 gWhat can Chan Hee expect to observe about the samples after 16 days?
A
The mass of iodine-131 in sample 1 will be 7.5 g and in sample 2 will be 16 g.B
Three-fourths of each sample will have undergone radioactive decay.C
Ten grams of each sample will have undergone radioactive decay.D
One-half of each sample will still be iodine-131.23
Carlos arranges his notes about radioactive decay in a graphic organizer. He wants to add the labels shown.Label 1: PhotonLabel 2: PositronLabel 3: No change in mass number
A
Label 1: ZLabel 2: XLabel 3: YB
Label 1: XLabel 2: ZLabel 3: XC
Label 1: XLabel 2: ZLabel 3: YD
Label 1: XLabel 2: ZLabel 3: Z24
Calcium-51 has a half-life of 4.5 days. Only 0.75 gram remains of a sample that was initially 12 grams.How old is the sample of calcium-51?
A
4.5 daysB
9.0 daysC
13.5 daysD
18 days25
Which characteristics of a radioisotope make it useful for diagnosing medical problems?
A
a long half-life and it is taken up by a specific part of the bodyB
a long half-life and it is not taken up by the bodyC
a short half-life and it is taken up by a specific part of the bodyD
a short half-life and it is not taken up by the bodyDid you find these answers helpful?
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