Answer:Half-life is the amount of time it takes for the initial mass of the isotope to decompose, by half, into other lighter atoms.
Explanation:Different radioactive isotopes have different half-lives. For example, the element technetium-99m has a half life of 6 hours. This means that is 100 kg of the element is left to decay, in 6 hours, 50kg of the mass will have changed into other elements/atoms. The half-life of uranium-238 is 4.5 billion years while that of polonium-216 is only 0.145 seconds.
Answer:
YOUR ANSWER IS GIVEN BELOW:
Explanation:
The abundance of helium in the universe and the redshift of light from the galaxies.
Potassium is the 19th element so it is B
Physics contributes to the technological infrastructure and provides trained personnel need to take advantage of scientific advances and discoveries.
Physics is an important element in the education of chemists, engineers and computer scientists as well as practitioners of the other physical and biomedical sciences .
Answer:
6 centimeter = 60 millimeter
Explanation:
1 meter = 100 centimeter
1 centimeter = 0.01 meter
Thus, 6 × 1 centimeter = 6 × 0.01 meter
6 centimeter = 0.06 meter
Hence, first option is wrong.
1 centimeter = 10 millimeter
6 × 1 centimeter = 6 × 10 millimeter
6 centimeter = 60 millimeter
Thus, third option is correct.
