What is the energy of an electromagnetic wave that has a frequency of 4.0 x 10 ^9 Hz A= 1.7 x 10^43 J
B=1.7 x 10^-43 J
C=2.7 x 10^24 J
2.7 x 10^-24 J
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The sound level near a noisy air conditioner is 70 db. if two such units operate side by side, the sound level near the, would bea. 70dbb. 73 dbc. 105 dbd 140 db

Large electric fields in cell membranes cause ions to move through the cell wall. the field strength in a typical membrane is 1.0 x 10 7 n/c. what is the magnitude of the force on a calcium ion with charge +e? what is its acceleration? is it possible for a particle with the same charge as as calcium to have a different acceleration if placed at this location? what would change the acceleration: mass of the particle? diameter of the particle?

Debris produced by mining is called