The density of an object is defined as
A. the volume occupied by each unit of mass.
B. the amount of mass for each unit of volume.
C. the weight of each unit of volume.
D. the amount of the substance that has unit volume and unit mass.
E. the amount of the substance that contains as many particles as 12 grams of the carbon-12 isotope.
Answer: B
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Spectral Series: The Paschen series is formed by electron transitions that
A. end on the n = 1 shell. B. begin on the n = 1 shell. C. end on the n = 2 shell. D. begin on the n = 3 shell. E. end on the n = 3 shell.
A particle (mass = 6.7 × 10?27 kg, charge = 3.2 × 10?19 C) moves along the positive x axis with a speed of 4.8 × 105 m/s. It enters a region of uniform electric field parallel to its motion and comes to rest after moving 2.0 m into the field. What is the magnitude of the electric field?
A. 2.0 kN/C B. 1.5 kN/C C. 1.2 kN/C D. 3.5 kN/C E. 2.4 kN/C
One possible explanation for a galaxy's type invokes the angular momentum of the protogalactic cloud from which it formed. Suppose a galaxy forms from a protogalactic cloud with a lot of angular momentum
Assuming its type has not changed due to other interactions, we'd expect this galaxy to be ________. A) a spiral galaxy B) an elliptical galaxy C) a torn and incoherent galaxy D) an irregular galaxy
An alpha particle is another name for a(n) __________
Fill in the blank(s) with correct word