Which of the following types of radiation can be blocked with only a sheet of paper? beta decay, gamma decay, they are equally dangerous, alpha decay

frequency, z, and the collision density, z, in carbon dioxide (co2), r 180 pm at 30 °c and 120 kpa

c-14 is carbon-14, or radiocarbon.   it is a radioactive isotope of carbon with an atomic nucleus containing 6 protons and 8 neutrons.

the answer is 75.0%.