The Planck length is the length at which
A) strong nuclear force effects between quarks are expected to become important.
B) electric charge becomes a meaningless concept.
C) quantum gravitational effects are expected to become important.
D) quarks are expected to be squeezed out of existence.
E) photons acquire mass and move slower than lightspeed.
C
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Current: If 3.0 × 1015 electrons flow through a section of a wire of diameter 2.0 mm in 4.0 s, what is the current in the wire? (e = 1.60 × 10-19 C)
A. 0.12 mA B. 0.24 mA C. 7.5 × 107 A D. 7.5 × 1014 A
Regarding the effect of modern physics on the Newtonian worldview,
A) both the quantum and relativity theories alter the Newtonian worldview significantly, but quantum theory alters it more radically than relativity. B) quantum theory does not alter the Newtonian worldview, but relativity theory alters it significantly. C) relativity theory does not alter the Newtonian worldview, but quantum theory alters it significantly. D) quantum theory and relativity theory both alter the Newtonian worldview only slightly. E) both the quantum and relativity theories alter the Newtonian worldview significantly, but relativity alters it more radically than quantum theory.
The ______________ occurs on June 21
a. autumnal equinox b. winter solstice c. summer solstice d. vernal equinox
In order to calculate the fraction of the total power delivered to the load resistor in a circuit consisting of a battery and a load resistor, one needs to know only the
1.load resistance. 2.internal resistance. 3.load resistance and internal resistance. 4.emf, load resistance, and internal resistance.