The isotope, tritium, has a half-life of 12.3 years. Assume we have 10 kg of the substance. How much tritium will be left after 30 years?
a. 0.20 kg
b. 1.8 kg
c. 0.18 kg
d. 1.7 kg
e. 4.1 kg
B
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A) gets almost completely absorbed before it reaches Earth's surface. B) has a wavelength that is longer than the visible light emitted by the star. C) has a wavelength that is shorter than the X-rays emitted by the star. D) reaches most of Earth's surface through atmospheric windows.
An atom that has fewer electrons than protons is called a(n)
A) ion. B) molecule. C) solid. D) plasma.
Another term for a spreading center is
A) convergent boundary. B) divergent boundary. C) transform fault boundary. D) none of the above.
If the fastest you can safely drive is what is the longest time you can stop for dinner if you must travel in total?
A) 1.0 h B) 1.3 h C) 1.4 h D) You can't stop at all.