Antiprotons and positrons are examples of ______________, which are not ordinary matter
Fill in the blank(s) with correct word
antimatter
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How do astronomers determine the distance to stars that are farther than 100 parsecs away?
a. measuring the shift of the stellar parallax b. estimating a star's spectral type and comparing it to the spectroscopic parallax c. subtracting absolute from apparent magnitudes d. using trigonometry in the triangulation method e. measuring the proper motion of a star
Two masses m1 and m2, with m1 < m2, have momenta with equal magnitudes. How do their kinetic energies compare?
a. KE1 < KE2 b. KE1 = KE2 c. KE1 > KE2 d. More information is needed.
About how big is an atom?
a. too small to measure b. about a millionth of a meter across c. about a billionth of a meter across d. about a trillionth of a meter across e. none of the above
What sort of politics flow around materials? Explain and give any example(s) you can
What will be an ideal response?