A student wants to establish a standing wave on a wire 1.8 m long clamped at both ends. The wave speed is 540 m/s. What is the minimum frequency she should apply to set up standing waves?
150 Hz
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Thin Lenses: When an object is placed 118 cm from a thin diverging lens, its image is found to be 59 cm from the lens. The lens is removed, and replaced by a thin converging lens whose focal length has the same magnitude as the diverging lens. This second lens is at the original position of the first lens. Where is the image of the object now?
Fill in the blank(s) with the appropriate word(s).
A wire of radius 0.15 mm is made of an unknown metal and carries a current of 8.4 mA. The drift velocity for electrons in the wire is measured to be 36 x 10-6 m/s. What is the carrier density of the metal from which the wire is made?
A. 
B. 
C. need more information to do this calculation.
D. 
Series/Parallel Circuits: A 22-A current flows into a parallel combination of 4.0-?, 6.0-?, and 12-? resistors. What current flows through the 12-? resistor?
A. 18 A B. 11 A C. 7.3 A D. 3.7 A
What is diffuse radiation?
What will be an ideal response?