What is electric resistance? What characteristics of a wire determine its resistance? How does resistance normally vary with temperature?
What will be an ideal response?
Answer: Electric resistance is the opposition a conductor offers to the migration of electrons. It depends on the wire material and dimensions of the wire. Resistance generally increases with increasing temperature. In some materials, called superconductors, resistance decreases to zero at critically low temperature.
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Imagine that sound waves with a certain definite wavelength flow through a partially open sliding door. If the wavelength of the waves increases, the angle through which the sound waves are diffracted
A. Decreases. B. Increases. C. Remains the same. D. Depends on quantities not specified (explain).
In a spectroscopic binary system, the star showing the larger blue shift is:
A) cooler and receding the fastest. B) less massive of the pair and receding slower. C) more massive and approaching us. D) less massive and approaching us at this moment. E) hotter and receding faster.
As the Moon grows fatter from new to full, it is said to wax
Indicate whether the statement is true or false
The circumference of a bicycle wheel is 2 meters. If it rotates at 1 revolution per second then its linear speed is
A) 1 m/s. B) 2 m/s. C) 3 m/s. D) 3.14 m/s. E) 6.28 m/s.