The elements listed in the choices are radioactive materials. These materials are very unstable because of the high neutron-to-proton ratio in the nucleus. Because of this, they spontaneously undergo nuclear reactions by giving off sub-particles in order to lower the ratio. They emit radiation in the form of alpha, beta or gamma.
Half-life is the length of time it needs to completely react half of the original amount. For example, it would take Bismuth 60.5 seconds to use up half of its amount. Therefore, the lower the half-life the faster the reaction is and the lesser the residual amount will be. With that being said, the answer would be Bismuth because it only takes seconds.
John Paul Jones was a Revolutionary War hero known as the father of the U.S. Navy. ... When the American Revolution broke out, Jones sided with the colonists and joined the Continental Navy, with his greatest victory coming from his against-all-odds defeat of the British warship Serapis in 1779.
Pro: Goods Became More Affordable and More Accessible. ...
Pro: The Rapid Evolution of Labor-Saving Inventions. ...
Pro: The Rapid Evolution of Medicine. ...
Pro: Enhanced Wealth and Quality of Life of the Average Person. ...
Con: The Rise in Unhealthy Habits
Con: Poor Working Conditions
Con: Pollution and Other Environmental Ills
Answer:earth
Explanation:
Setting up the seasons. The direction of Earth's revolution is in the direction of its rotation. Because the path around the sun is not circular, we are closer to the sun at certain time of the year.
C. Japan only uses renewable energy sources.
