How long will it take a 4.50-kBq sample of material to reach an activity level of 0.140 kBq if the half-life of the sample is 435 years?
A) 3245 years B) 1993 years C) 2178 years D) 14,478 years
C
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Heat is thermal energy that matter
A) contains. B) transfers. C) both of these D) none of the above
The primary mechanism for the absorption of infrared radiation is by excitation of:
(a) The core atom electrons (b) Atomic vibrations (c) The nucleus (d) Valence-band electrons
During a positron emission tomography (PET) scan of the brain,
A) an external positron beam is sent through the patient's brain and detected as it leaves the patient. B) matter and antimatter annihilate within the brain to create positrons that are detected as they leave the patient. C) radioactive fluorine creates positrons within the brain that are detected as they leave the patient. D) positrons and electrons annihilate within the brain to create gamma photons that are detected as they leave the patient. E) highly sensitive detectors measure the positrons that are naturally emitted by the human body.
Most small moons tend to be old and geologically inactive. Explain why Enceladus appears to break that general rule
What will be an ideal response?