Answer:
B and C
Explanation:
B. In a given rock sample, the amount of Silicon-32 isotopes gets divided in half about every 170yrs.
This is the concept of half-life. Half life is the time take for half of a radioactive isotope to disintegrate. The shorter the half life the faster the isotope disintegrates.
From the question, we were told that it would take 170yrs for half of the isotope of Silicon to disintegrate to Phosphorus. This is the half life.
C. The half life can be used to determine the amount of Si-32 that has decayed from the time closure temperature was reached.
The closure temperature is very important in radioactivity. It is the temperature at which a system has cooled and there is no resulting disintegration of parent and daughter isotopes.
From first order kinetics, we know that the rate at which radioactive elements decay at any time is directly proportional to the number of radioactive atoms present. A knowledge of the half life helps to figure out the number of atoms that has decayed in time.
The Answer is Solar Energy
Answer:
The asteroid belt is a torus-shaped region in the Solar System, located roughly between the orbits of the planets Jupiter and Mars
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Answer:
Three Gorges Dam becomes popular tourist site. The Three Gorges Dam, the largest of its kind in the world, in central China has become a popular tourist site which attracted an estimated 100,000 tourists in the week-long May Day holiday, a travel agency executive said on Friday. The Three Gorges Dam includes three areas: the dam itself, a hydroelectric, and a system of locks. The height of the Three Gorges Dam is 185 meters (607 ft) above the sea level. The dam is about 2,300 meters (7,546 ft) long and about 115 meters (377 ft) wide.
Explanation:
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