Quiz 5
The half life of a carbon 14 is 5730 years. If a 1 gram sample of old carbon is 1/8 as radioactive as 1 gram of a current sample, then the age of the old sample is about a. 716 years b. 11,500 years c. 17200 years d. 22900 years
17200
Which radium (A=88) emits an alpha particle, the resulting nucleus has atomic number a.86 b.88 c.90 d.92
86
which radiation has no association with electric charge? a.alpha b.beta c. gamma
Gamma
When thorium (A=90) emits a beta particle, the resulting nucleus has atomic number of a.88 b.90 c.92 d. none
None of the above
For an isotope with a half-life of one day, at the end of two days the amount that remains is a. none b. one-half c. one-quarter d. one-eighth
One-quarter
Which of the following isotopes is radioactive? a. carbon-12 b. carbon-14 c. both d. neither
carbon-14
when the nucleus of an atom emits a beta particle, the atom's atomic number a. increases b. decreases c. doesnt change
increases
Radiation dosages based on potential damage is in a.rads b.rems c. joules
rems
Which device is used primarily to detect nuclear raditation? a. synchrotron b. linear accelerator c. cyclotron d. scintillation counter
scintillation counter
x rays are emitted by way of a. ionizing radiation b. transitions within an atom's innermost electrons c. transitions within the atomic nucleus
transitions within an atom's innermost electrons