What Relationship Can Be Determined from the Following Information

question 42

Multiple Choice

What relationship can be determined from the following information:
• The radioactive isotope iodine 131 has a half-life of 8.1 days and emits 0.8 MeV (milli-electronvolts) of energy.
• The radioactive isotope phosphorus 32 has a half-life of 14.3 days and emits 1.7 MeV of energy.
• The radioactive isotope phosphorus 33 has a half-life of 25.5 days and emits 0.25 MeV of energy.
• The radioactive isotope sulfur 35 has a half-life of 87.5 days and emits 0.2 MeV of energy.

• A)The longer the half-life,the more energy emitted by the particles.
• B)The longer the half-life,the less energy emitted by the particles.
• C)Radioisotopes of the same element must emit the same amount of energy in their emissions and decay at the same rate.
• D)Adjusted for time,radioisotopes emit the same amount of energy in their emissions.
• E)Energy and half-life are not directly related.

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