A Geiger counter registers a count rate of 7,600 counts per
minute from a sample of a radioisotope. Ten minutes later, the
count rate is 1,900 counts per minute. What is the half-life of the
radioisotope?
A Geiger counter registers a count rate of 7,600 counts per minute from a sample of...
A Geier counter registers a count rate of 6,000 counts per minute from a sample of a radioisotope. Eighteen minutes later, the count rate is 1,500 counts per minute. What is the half-life of the radioisotope? ________ minutes
A sample of a particular radioisotope is placed near a Geiger counter, which is observed to register 160 counts per minute. Eight hours later, the detector counts at a rate of 10 counts per minute. What is the half-life of the material (in minutes)?
A Geiger counter reading of a radioactive sample is initially 7020 counts per minute. The same sample gives a reading of 402 counts per minute 10.6 h later. What is the sample's half-life?
Suppose counts recorded by a Geiger counter have an average of four counts per minute. What is the probability that the first count occurs is less than 3 minutes?
2.Suppose counts recorded by a Geiger counter have an average of seven counts per minute. a.What is the probability that there are no count in a 45 second interval? b.What is the probability that the first count occurs is less than 2 minutes?
21. A Geiger counter registered 1000 counts/second from a sample that contained a radioactive isotope of polonium. After 5.0 minutes, the counter registered 281 counts/second. What is the half-life of this isotope in seconds? (a) 87 (b) 164 (c) 364 (d) 264 (e) 2.18
If a rock containing U-238 initially reads 78.8 counts per minute on a Geiger counter, what will its reading be 8 weeks later?
If a rock containing U-238 initially reads 92.4 counts per minute on a Geiger counter, what will its reading be 3 weeks later?
*Uncertainty in background counts The background counts (C) detected in 5 minutes by a Geiger counter is found to be C = 321. The background count rate per minute (C/min) can be easily determined. What is the uncertainty in this value (ΔC/min)? Express your answer to one decimal place.
A sample is counted and found to have 952 counts per minute. Seven minutes later it is measured again and has a count of 148 counts per minute. A background measurement gave 6 counts per minute. What is the half-life of the sample?