Two copper wires, one double the diameter of the other, have the same current flowing through them.If the thinner wire has a drift velocity v1, and the thicker wire has a drift velocity v2, how do the drift velocities of the charge carriers compare?
A. v1 = v2
B. v1 = 2 v2
C. 2 v1 = v2
D. v1 = 4 v2
E. 4 v1 = v2
D. v1 = 4 v2
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The lifetime of an excited nuclear state is 1.0 ns. What is the minimum uncertainty in the energy of this state? ( h = 1.055 × 10-34 J ? s = 6.591 × 10-16 eV ? s, 1 eV = 1.60 × 10-19 J)
A) 3.3 × 10-7 B) 1.0 × 10-9 C) 6.6 × 10-7 D) 6.6 × 10-25 E) 1.0 × 10-25
_________ is equal to the angular distance from the horizon to the north celestial pole
Fill in the blank(s) with correct word
The singularity of a black hole
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Photography Optics: A 35-mm single lens reflex (SLR) digital camera is using a lens of focal length 35.0 mm to photograph a person who is 1.80 m tall and located 3.60 m from the lens.(a) How far is the CCD sensor from the lens when the person is in focus?(b) How tall is the person's image on the CCD sensor?
What will be an ideal response?