1. Radioactive dating works by measuring the
ratio of isotopes ***
amount of radioactivity absorbed
radioactivity left
time it takes for the radioactivity to disappear
2. Larger atoms get broken into smaller atoms in
nuclear reactors***
the Sun
X-ray machines
calorimeters
4. If two 1/1 H fused to form 2/1 H, there would be
no change in mass
a change in mass of one proton***
no change in energy
the loss of a neutron
5. A nuclear reactor produces
bombs
electricity***
a fusion reaction
the same energy as the sun
6. PET scans use
X-rays
gamma radiation
positrons***
alpha emissions
I agree with your answers but I think #1 has two answers. a is correct but so is c.
3. The process of decay in which an unstable nucleus emits an alpha particle is called
alpha decay***
beta decay
gamma decay
electron capture
7. The primary source of energy in the Sun is
nuclear fission
nuclear fusion***
nuclear decay
nuclear transmutation
8. The half-life of a radioactive substance is the time it takes for
half of the substance to decay***
all of the substance to decay
one-third of the substance to decay
two-thirds of the substance to decay
9. The process of nuclear fusion involves
combining two or more small atomic nuclei to form a larger nucleus***
splitting a large atomic nucleus into two or more smaller nuclei
the conversion of mass into energy
the emission of gamma rays
10. The process of radioactivity was discovered by
Albert Einstein
Marie Curie***
Isaac Newton
Thomas Edison
1. Radioactive dating works by measuring the ratio of isotopes. To understand this concept, we need to consider the principles of radioactive decay. Radioactive isotopes decay over time, transforming into different isotopes and releasing radiation in the process. This decay occurs at a known rate, which is called the half-life of the isotope. By measuring the ratio of the parent isotope to the daughter isotope in a sample, scientists can determine how long it has been since the decay started. This is the basis of radioactive dating.
2. Larger atoms get broken into smaller atoms in nuclear reactors. Nuclear reactors are designed to harness the process of nuclear fission, which involves splitting atoms. In this process, the nucleus of a large atom, often uranium or plutonium, is bombarded with neutrons, causing it to split into two or more smaller atoms, releasing energy in the process. This energy can be used to generate electricity in nuclear power plants.
4. If two 1/1 H (hydrogen atoms) fused to form 2/1 H (deuterium), there would be a change in mass of one proton. Deuterium is an isotope of hydrogen that has an extra neutron in its nucleus. When two hydrogen nuclei fuse together, they form deuterium. Since the nucleus of a hydrogen atom consists of a single proton, the fusion process results in the combination of two protons into a deuterium nucleus. Therefore, there is a change in mass of one proton.
5. A nuclear reactor produces electricity. Nuclear reactors generate electricity by using controlled nuclear reactions, specifically nuclear fission. In a nuclear reactor, the splitting of atoms, usually uranium or plutonium, releases a large amount of energy in the form of heat. This heat, produced by the chain reaction of nuclear fission, is then used to produce steam, which drives turbines connected to generators and produces electricity.
6. PET scans use positrons. PET (Positron Emission Tomography) scans are a medical imaging technique that uses radioactive isotopes to detect and visualize specific metabolic activity in the body. In PET scans, a small amount of a radioactive tracer, such as fluorodeoxyglucose, is injected into the patient's body. This tracer emits positrons, which are positively charged particles. These positrons then interact with electrons in the body, resulting in the emission of gamma rays. The detectors in the PET scanner detect these gamma rays and use the data to construct detailed images of the body's metabolic activity.