What is the best conclusion for the events taking place on a molecular level in the images seen here? A)
B)
Kinetic energy decreases from left to right. The fourth state, plasma, has
the most kinetic energy and the atoms disassociate.
Heat energy is continuously added at each step. As energy is added, the
molecular motion/kinetic energy increases, and matter changes state. In
the last state, plasma, enough energy has been added to cause the atoms
to disassociate into ions.
At each step, the state of matter changes. At each step, the molecular
motion of the atoms increases because there is a decrease in pressure.
During the final step, there is so little pressure that the atoms separate into
protons and electrons.
Matter changes state when there is a change in temperature. In each step.
the temperature decreases causing a change in state. At the last state,
plasma, the temperature is so low that the atoms cannot stay together and
they disassociate into ions.
D)

Ten students stand in a circle and are told to make a transverse wave. what best describes the motion of the students? each student bumps the shoulder of his or her neighbor. at the exact time, all students take a step to the right. the students skip clockwise, going in a circular motion. one at a time, each student lifts his or her hands up and then down.

Astudent wears sunglasses to her read a book more easily which wave interaction occurs as light passes from the air into the plastic lenses? a polarization b. refraction c. diffraction d. interference

Search coils and credit cards. one practical way to measure magnetic field strength uses a small, closely wound coil called a search coil. the coil is initially held with its plane perpendicular to a magnetic field. the coil is then either quickly rotated a quarter-turn about a diameter or quickly pulled out of the field. (a) derive the equation relating the total charge q that flows through a search coil to the magnetic-field magnitude b. the search coil has n turns, each with area a, and the flux through the coil is decreased from its initial maximum value to zero in a time ∆t. the resistance of the coil is r, and the total charge is q = i∆t, where i is the average current induced by the change in flux. (b) in a credit card reader, the magnetic strip on the back of a credit card is rapidly “swiped” past a coil within the reader. explain, using the same ideas that underlie the operation of a search coil, how the reader can decode the information stored in the pattern of magnetization on the strip. (c) is it necessary that the credit card be “swiped” through the reader at exactly the right speed? why or why not?