Explain why observations suggest the presence of dark energy in the universe.?
What will be an ideal response?
Observations show that the expansion rate of the universe was slower in the past than its current value. Gravity slows the expansion rate with time so the observed acceleration implies the existence of a new force or energy that h as not been recognized before.
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For what frequency range is the reactance of a 3.3 ?F larger than a 3.3 ? resistance where the capacitor, resistance, and a 3.3 mH inductor are in series?
What will be an ideal response?
The quantum mechanical model of the hydrogen atom requires that if the principal quantum number = 5, there will be how many permitted orbital magnetic quantum numbers?
a. 4 b. 5 c. 10 d. 9 e. 11
A long nonconducting cylinder (radius = 12 cm) has a charge of uniform density (5.0 nC/m3) distributed throughout its column. Determine the magnitude of the electric field 5.0 cm from the axis of the cylinder
a. 25 N/C b. 20 N/C c. 14 N/C d. 31 N/C e. 34 N/C
Niels Bohr postulated that the hydrogen electron radiates energy only when it makes a(n) ______________ from one allowed orbit to another
Fill in the blank(s) with correct word