A changing magnetic flux through a closed loop of wire induces an emf in that loop
Indicate whether the statement is true or false
TRUE
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Chemical disequilibrium inevitably exists near deep-sea volcanic vents, because
A) there are unequal concentrations of minerals and water B) the high-temperature vent water causes water molecules to break down into hydrogen and oxygen C) mixing between the high-temperature vent water and the surrounding low-temperature ocean water creates conditions in which minerals and water will undergo chemical reactions D) the high pressures existing at the ocean floor cause chemical reactions between minerals and water
In ultrasound the __________ of the sound is much greater than in normal sound
Fill in the blank(s) with correct word
A parallel circuit consists of a 100-V DC power source, a 100-? resistor, and a variable resistor of resistance R, which varies from 0 to 100 ?. The current in the circuit is
?
?
a.
directly proportional to R.
b.
inversely proportional to R.
c.
directly proportional to (100 ? + R).
d.
inversely proportional to (100 ? + R).
e.
neither directly nor inversely proportional to R or to (100 ? + R).
Fiber optics in a DVD player contain their light by employing total internal reflection. Designers surround the pure glass core with another type of glass, called cladding, that has a different index of refraction from the core.
How should you select a cladding?
A. Cladding must have a larger index of refraction than the core B. Cladding must have a smaller index of refraction than the core