Q: Answer the following question given this paragraph: Accuracy means making measurements that are close to the true value. Q: What is making measurements that are close to the true value known as? A:

OPTIONS:
- estimation
- frequency
- prediction
- accuracy

A: accuracy

input: OPTIONS:
- transient particle
- radioactive particle
- ultraviolet particle
- gamma particle Now, answer this question: Answer the following question given this paragraph: Gamma rays are produced during gamma decay of an excited nucleus. During gamma decay, the nucleus emits a "packet" of energy called a gamma particle. Q: What is the"packet" of energy called that the nucleus emits during gamma decay? A:
A:
output: gamma particle

Answer the following question given this paragraph: A: All chemical equations must be balanced. This means that there must be the same number of each type of atom on both sides of the arrow. That's because mass is always conserved in chemical reactions. Count the number of hydrogen and oxygen atoms on each side of the arrow. There are two hydrogen atoms in both reactants and products. There are two oxygen atoms in the reactants but only one in the product. Therefore, equation 1 is not balanced. Q: What is always conserved in chemical reactions? A:

OPTIONS:
- energy
- bonds
- force
- mass

Answer: mass

Problem: OPTIONS:
- biologist
- entymologist
- anthropologist
- epidemiologist
Q: Answer the following question given this paragraph: Epidemiologist Epidemiology is the study of the occurrence, distribution, and determinants of health and disease in a population. It is, therefore, part of public health. An epidemiologist studies the frequency and distribution of diseases within human populations and environments. Epidemiologists collect data about a particular disease and track its spread to identify the original mode of transmission. They sometimes work in close collaboration with historians to try to understand the way a disease evolved geographically and over time, tracking the natural history of pathogens. They gather information from clinical records, patient interviews, surveillance, and any other available means. That information is used to develop strategies, such as vaccinations (Figure 22.26), and design public health policies to reduce the incidence of a disease or to prevent its spread. Epidemiologists also conduct rapid investigations in case of an outbreak to recommend immediate measures to control it. An epidemiologist has a bachelor's degree, plus a master's degree in public health (MPH). Many epidemiologists are also physicians (and have an M. ), or they have a Ph. in an associated field, such as biology or microbiology. Q: What is a person who studies the frequency and distribution of disease within human populations and environments called? A:
Answer: epidemiologist

Problem:OPTIONS:
- magnesium
- calcium
- nitrogen
- chlorine

Answer the following question given this paragraph: Hydrogen chloride contains one atom of hydrogen and one atom of chlorine. Because the. Q: Hydrogen chloride contains one atom of hydrogen and one atom of what? A:
****
A: chlorine

Problem:OPTIONS:
- polymer substances
- devil substances
- eerie substances
- phosphorescent substances

Answer the following question given this paragraph: Once excited, an atom or molecule will usually spontaneously de-excite quickly. (The electrons raised to higher levels are attracted to lower ones by the positive charge of the nucleus. ) Spontaneous de-excitation has a very short mean lifetime of 8 typically about 10 s . However, some levels have significantly longer lifetimes, ranging up to milliseconds to minutes or even hours. These energy levels are inhibited and are slow in de-exciting because their quantum numbers differ greatly from those of available lower levels. Although these level lifetimes are short in human terms, they are many orders of magnitude longer than is typical and, thus, are said to be metastable, meaning relatively stable. Phosphorescence is the de-excitation of a metastable state. Glow-in-the-dark materials, such as luminous dials on some watches and clocks and on children's toys and pajamas, are made of phosphorescent substances. Visible light excites the atoms or molecules to metastable states that decay slowly, releasing the stored excitation energy partially as visible light. In some ceramics, atomic excitation energy can be frozen in after the ceramic has cooled from its firing. It is very slowly released, but the ceramic can be induced to phosphoresce by heatinga process called "thermoluminescence. " Since the release is slow, thermoluminescence can be used to date antiquities. The less light emitted, the older the ceramic. (See Figure 30.35. Q: What makes luminous dials glow in the dark? A:
****
A:
phosphorescent substances