Study the interaction of the light rays with the mediums. classify the medium in each image as being transparent or opaque.

Carbon-14 is a radioactive element that undergoes beta decay. which force is responsible for allowing carbon-14 to become stable? electromagnetic gravitational weak nuclear strong nuclear

The electronic structure or chlorine is 2.8.7 what is the electronic structure of fluorine?

Considering only the earth's rotation, determine how much later the asteroid would have had to arrive to put the explosion above helsinki at longitude 25˚ e? this would have obliterated the city.