The decay of a sample of radioactive atoms is studied by observers moving in different ways. One moves at 0.8c, another at 0.5c, another at 0.25c, and one at speed zero with respect to the sample. The one with a speed of ________ will measure the shortest half-life.
Fill in the blank(s) with the appropriate word(s).
zero
0
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The helium fusion process results in the production of
A) hydrogen. B) oxygen. C) carbon. D) nitrogen. E) iron.
The periods of the Cenozoic era are divided into time units called ______________
Fill in the blank(s) with correct word
Two twin sisters, Gwen and Jackie, are both 20 years old in the year 2020. Jackie takes off on a round-trip to Vega, 25 light-years away. She travels at an average speed very close to the speed of light—say, 0.9999c
According to Gwen back on Earth, about how long does it take Jackie to reach Vega? A) about a month B) about 10 years C) about 25 years D) about 100 years
How does a star's luminosity relate to its radius and surface temperature?
What will be an ideal response?