A radioactive isotope has half-life of one year. How much of the original sample will be present after the third year?

1. 1/2
2. 1/4
3. 1/8
4. 1/16

Apersons beliefs and general outlook, which act like filters on the information they receive are called ?

Global warming will produce rising sea levels partly due to melting ice caps but also due to the expansion of water as average ocean temperatures rise. to get some idea of the size of this effect, calculate the change in length (in m) of a column of water 1.45 km high for a temperature increase of 1.12°c. assume the column is not free to expand sideways. as a model of the ocean, that is a reasonable approximation, as only parts of the ocean very close to

Newtons view of arrangement of the universe. don't copy from anywhere.