The quantum mechanical model of the hydrogen atom requires that if the orbital quantum number of the hydrogen atom is 7, there will be how many permitted orbital magnetic quantum numbers?
a. 6
b. 7
c. 14
d. 15
e. 49
d
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Galactic collisions ____
a. are very rare, since few galaxies are in clusters b. will cause stars in each galaxy to collide and trigger supernova events c. often trigger bursts of star formation d. only happen in poor clusters e. usually break large galaxy into several small ones
We have an initially uncharged hollow metallic sphere with radius of 5.0 cm. I place a small object with a charge of +20 µC at the center of the sphere through a hole in the surface. Find the electric field present at a point 10 cm from the sphere's center. (ke = 8.99 × 10^9 N/m2/C2)
a. 3.6E+7 N/C b. 9.0E+6 N/C c. 1.8E+7 N/C d. 4.5E+6 N/C e. 2.7E+7 N/C
An automobile's acceleration cannot be changed by using the
a. gas pedal. b. brake pedal. c. steering wheel. d. stick shift. e. turn signal.
Density: A plastic block of dimensions 2.00 cm × 3.00 cm × 4.00 cm has a mass of 30.0 g. What is its density?
A. 0.80 g/cm3 B. 1.20 g/cm3 C. 1.25 g/cm3 D. 1.60 g/cm3