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Smallest intensity of a stimulus that you can detect 50 percent of the time is

Describe how the motion of a spring being pushed forward and backward is similar to the motion of air particles in a sound wave.

Abeam of electrons moves at right angles to a magnetic field of 4.5 × 10-2 tesla. if the electrons have a velocity of 6.5 × 106 meters/second, what is the force acting on the electrons? the value of q = -1.6 × 10-19 coulombs.