Week 13
Radon-222 alpha decays to Polonium-218 , and the half-life is 4 days. If you start with 4 grams of Radon-222, how much will you have after 16 days? 0 g 0.5 g 1 g 0.25 g
d
The forces that hold the nucleus together act over only very short distances. are much stronger than electromagnetic forces. are attractive, that is, they pull in the inward direction. all of the above. none of the above
d
If you start with 6 grams of pure carbon-14, how much is left after 18000 years? Assume the halflife of carbon-14 is 6000 years 1.5g 3g 0g .375g .75g
e
How many neutrons are in one atom of oxygen-17 ?
9
Radium-228 beta decays. What is the daughter nucleus? (Radium is element 88) Actinium-228 Thorium-232 Francium-228 Radon-224
a
Strontium-90 has a half life of 30 years. If we start with 10 grams, how long until we have only 1.25 grams? 90 years 150 years 120 years 60 years
a
Would you expect radon (atomic number 86) to be radioactive? Yes No
a
How many protons and neutrons are in this nucleus? Uranium 235 92 92 protons and 235 neutrons 92 protons and 143 neutrons 235 protons and 92 neutrons 92 protons and 327 neutrons
b
Polonium-209 alpha decays. What is the daughter nucleus? (Polonium is element 84) mercury-207 lead-205 astatine-209 radon-213
b
What radioactive substance is typically in ionization chamber smoke detectors? polonium americium radon plutonium
b
Who discovered radioactivity? Marie Curie Henri Becquerel Wilhelm Roentgen Albert Einstein
b
Among the following list, the largest single source of radiation in the environment is medical diagnosis cosmic rays radon nuclear power plants fallout
c
Hydrogen-3 ( 3H) will radioactively decay into helium-3 ( 3He). Which type of decay is this? gamma decay alpha decay beta decay delta decay
c
Two different isotopes of the same element have different numbers of protons but the same number of neutrons different chemical properties the same number of protons, but different numbers of neutrons. different numbers of electrons. different numbers of both protons and neutrons
c
What is in the orange fiesta ware that makes it radioactive? (orange plate) bismuth astatine uranium radium plutonium
c
What is the daughter nucleus when 212Bi alpha decays? 216At 212Pb 208Tl 212Po
c