The distance from Earth to the Sun is about 93 million miles. How many times this distance is the size of the Milky Way galaxy?
a. Roughly 10 million times.
b. Roughly 10 thousand times.
c. Roughly 10 billion times.
d. Roughly 100 billion times.
c
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A distance R away from a light source we observe which of the following for the electromagnetic field it produces?
A) Both the light intensity and the magnitude of the electric field drop as 1/R2. B) The light intensity drops as 1/R2, but the magnitude of the electric field drops as 1/R. C) Both the light intensity and the magnitude of the electric field drop as 1/R. D) The light intensity drops as 1/R, but the magnitude of the electric field drops as 1/R2. E) None of the previous answers is correct.
Models for combining the electromagnetic, weak and strong nuclear interactions into a single basic force are __________
Fill in the blank(s) with correct word
A “free” electron and a “free” proton are placed in an identical electric field. Is the following statement true or false?
The electric force on the proton is greater in magnitude than the electric force on the electron, but in the opposite direction.
1.False 2.TrueWhy can we never create energy?
A) because it is impossible to create the fundamental particles such as electrons and protons B) because energy is always conserved C) because of the equivalence of mass and energy D) because matter is always conserved E) Actually, we do create energy frequently in the lab.