There are about as many atoms of air in our lungs at any moment as there are breaths of air in the atmosphere of
A) a large auditorium.
B) a large city.
C) the United States.
D) the whole world.
E) none of the above
Answer: D
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What is the approximate age of the star cluster in the HR diagram below? (Hint: Main Sequence Stars of spectral between types A and B core supply of hydrogen is sufficient to last about 250 million years. Between A and F about 2 billion years.Type G about 10 billion years. Between K and M about 30 billion years..)
a.
200 million years
b.
2 billion years
c.
10 billion years
d.
30 billion years
e.
The age of the cluster can not be estimated from an HR diagram of the cluster.
The term "dirty bomb" refers to
A) a bomb that uses conventional explosive to disperse radioactive materials. B) a conventional chemical bomb that disperses pieces of metal in order to harm the maximum number of people. C) a nuclear device that is optimized for the release of radioactive materials. D) a nuclear device that releases neutrons in order to kill people without harming buildings and other structures. E) any nuclear device that is used for terrorist purposes.
Consider a 1000. Gauss magnetic field along the z axis and a proton moving with an instantaneous velocity of = 3 + 4 km/s (note its speed is 5. km/s composed of 3. km/s along the x axis and 4. km/s along the z axis)
Determine the radius of its spiraling orbit. [proton: 1.67 × 10-27 kg and 1.6 × 10-19 Coulomb]
A __________ has half integral spin
Fill in the blank(s) with correct word