The analytical procedure that bombards a sample with neutrons and measures the frequency of gamma rays emitted is called
a. the alpha scattering technique.
b. carbon dating.
c. neutron activation analysis.
d. Geiger counting.
c
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After recombination occurred, the Universe was plunged into a period of time known as the ___________, which lasted hundreds of millions of years until the first stars were born
Fill in the blank(s) with correct word
An X-ray telescope placed on the surface of Earth can detect X-rays that are emitted from a distant astrophysical source.
Answer the following statement true (T) or false (F)
How far away from Earth must one travel to completely be beyond Earth's gravity?
A) to a region above the Earth's atmosphere B) to a region well beyond the Moon C) to a region beyond the solar system D) forget it; you can't travel far enough
Who discovered that pole star change every few thousand years?
What will be an ideal response?