Physics School Exam Preparation
Authored by Kiki Nurhayati
Science
9th Grade
Used 4+ times
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26 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
The background count rate measured by a radiation counter is 50 counts per minute (cpm). With the counter close to a radioactive source, the counter reading is 290 cpm. The half-life of the source is 15 minutes.
What is the counter reading one hour later?
65 cpm
15 cpm
18.125 cpm
68.125 cpm
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
The background count rate measured by a radiation counter is 10 counts per minute (cpm). With the counter close to a radioactive source, the counter reading is 26 cpm. The half-life of the source is 3 minutes.
What is the counter reading 9 minutes later?
2 cpm
12 cpm
13 cpm
3.25 cpm
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the reading of GM counter after a half life of Uranium?
210 cpm
238 cpm
420 cpm
224 cpm
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the reading of GM counter after a half life of Uranium?
210 cpm
240 cpm
420 cpm
225 cpm
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the half-life of this isotope?
What is the half-life of this isotope?
400 minutes
2 days
2 minutes
400 days
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the half-life of this isotope?
What is the half-life of this isotope?
10 years
13.5 years
600 years
21 years
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the half-life of this isotope?
What is the half-life of this isotope?
2 days
1 days
1250 days
1000 days
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