If you could convert the Earth (mass 6×1027g) into pure energy, how much energy wouldbe produced (in ergs) compared to what the Sun produces over its whole life (1.2×1051ergs)? The speed of lightc= 3×1010cm/s.
a) more than 10 times more
b) three times less
c) roughly the same amount
d) three times more
e) more than 10 times less
Ans: e) more than 10 times less
Physics & Space Science
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Radioactive Decay: Given that the half-life for radium-226 is 1600 y, how long is the "quarter-life" (that is, the time for the radiation to decay to one-fourth of its initial level)?
Fill in the blank(s) with the appropriate word(s).
Physics & Space Science
Which of the following represents the maximum value of the magnetic field at a distance of 2.5 m from a 100 W light bulb?
A) 0.10 ?T B) 0.40 ?T C) 0.50 ?T D) 0.60 ?T E) 0.80 ?T
Physics & Space Science
Winds on Mars give rise to planet-wide dust storms
Indicate whether the statement is true or false
Physics & Space Science
Which travels fastest in a vacuum?
A) radio waves B) light C) X-rays D) all the same
Physics & Space Science