A cordless phone operates at 900 MHz. What is the associated wavelength?
What will be an ideal response?
0.33 m
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If a 22 
resistor has a current of 2.0 A flowing through it, what is the potential difference across it?
A. 0.091 V B. 44 V C. 11 V D. 24 V E. 20 V
Why didn't a planet form in the region of the solar system now occupied by the asteroid belt?
A. It was too cold for a rocky planet to form beyond Mars. B. Orbital resonances with Jupiter disrupted orbits in this region. C. Gravitational encounters with jovian planets kicked most of this material out into the Oort cloud. D. There was never enough material to form a planet.
Identical point charges (+20 ?C) are placed at the corners of an equilateral triangle with sides of 2.0-m length. How much external energy is required to bring a charge of 45 ?C from infinity to the midpoint of one side of the triangle?
A. 26 J B. 16 J C. 23 J D. 21 J E. 12 J
What is the direction of the air circulation around a high-pressure cell in the northern hemi sphere?