1..35 x 10^15
100 grams
100 grams
All radioactive material has a characteristic half-life. This is a period during which half the matter from the original mass will have decayed into a daughter element. Either the daughter element is non-radioactive and therefore non-hazardous or it is radioactive and has its own half-life. The total radioactivity thus reduces over time and at some stage is deemed to reach a non-hazardous level.
18 grams are one fourth of the original sample mass of 72 grams. Accordingly, the half life is 6.2/4 = 1.55 days.
"Funk You Up" by Sequence. Released in 1980.
2.25 x 10 15j
4.5 × 1015 J
2.25 times 10 to the 15
9 x 10^12 J
2.25 x 10 15j
4.5 × 1015 J
9 × 10^13 J
If all the mass was last as energy the Einstein's formula (Energy = Mass * The velocity of light in a vacuum squared) will give you the energy. However in normal radioactive decay mass is also lost from the sample as alpha particle and beta particles, not energy.
Radioactive material is warmer than the surrounding material because radioactive material is constantly breaking down. When material breaks down, that means that energy is constantly getting released. When energy is released, it produces warmth.
The sample must contain radioactive elements.
4.5 * 10^15 J
The length of time required for half of a sample of radioactive material to decay