Suppose that in a parallel universe, the proton and electron were identical to their counterparts in our own universe EXCEPT that the electron had twice as much charge as our electron. In our present universe,
the radius of the first Bohr orbit for hydrogen is a0 and the speed of an electron in that orbit is v0. In the parallel universe
(a) what would be the radius (in terms of a0 ) of the first Bohr orbit for hydrogen?
(b) what would be the speed (in terms of v0 ) of an electron in the first Bohr orbit for hydrogen?
(a) a0/2 (b) 2v0
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A 10-V battery is connected to a 15-? resistor and an unknown resistor R, as shown. The current in the circuit is 0.40 A. How much heat is produced in the 15-? resistor in 2.0 min?
A. 0.40 kJ B. 0.19 kJ C. 0.29 kJ D. 0.72 kJ E. 0.80 kJ
Remanent magnetism refers to the magnetism of rocks that contain the mineral named ______________
Fill in the blank(s) with correct word
If the inductance and the capacitance both double in an LRC series circuit, the resonant frequency of that circuit will
A) decrease to one-half its original value. B) decrease to one-fourth its original value. C) decrease to one-eighth its original value. D) increase to twice its original value. E) increase to four times its original value.
If one of the intrinsically brightest stars in our sky were 10pc away from Earth, it would appear:
A) more than 10 times as bright as Earth at its brightest. B) more than 25 times as bright as Venus at its brightest. C) more than 10 times as bright as Venus at its brightest. D) more than 25 times as bright as Earth at its brightest.