The decay rate of a radioactive sample decreases from 175 kBq to 12.4 kBq in 18.3 s. What is the half-life of this sample?
What will be an ideal response?
4.79 s
Physics & Space Science
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Why does our theory predict that neutron stars will have strong magnetic fields?
What will be an ideal response?
Physics & Space Science
Why are smaller terrestrial bodies such as Mercury or the Moon “geologically dead”?
a. They cooled off faster than Earth did. b. They don’t have erosion. c. They were hit by fewer meteorites than Earth. d. They are made of different materials than Earth.
Physics & Space Science
The mass of an apple on the Earth is 0.2 kg. On the Moon, the mass of the same apple would be
A. greater than zero but less than 0.2 kg. B. greater than 0.2 kg. C. 0.2 kg. D. zero.
Physics & Space Science
The Moon's average density is
a. greater than Earth's. b. less than Earth's. c. approximately the same as Earth's. d. nonexistent because water is not present.
Physics & Space Science