The isotope calcium-41 decays into potassium-41, with a half-life of 1.03 × 10^5 years. there is a sample of calcium-41 containing 5 × 10^9 atoms. how many atoms of calcium-41 and potassium-41 will there be after 4.12 × 10^5 years? how many calcium and how many potassium?

How manyatoms of mercury are in 1.4214e+1 ml sample

The peak wavelength for the blackbody curve of a star is in the uv range. assuming the radiation from this star can reach earth, would you be able to see it?

If we compare and contrast electromagnetic waves with sound waves, all but one statement is true. that is a) sound waves require a medium to travel while electromagnetic waves do not. b) electromagnetic waves can travel through the vacuum of space while sound waves cannot. c) electromagnetic waves must have a medium in which to travel, but sound waves can travel anywhere. eliminate d) sound waves must bounce off of matter in order to travel while electromagnetic waves do not require matter to be present.