An electron is released form rest in a region of space where a uniform electric field is present. Joanna claims that its kinetic and potential energies both increase as it moves from its initial position to its final position. Sonya claims that they both decrease. Which one, if either, is correct?
a. Joanna, because the electron moves opposite to the direction of the field.
b. Sonya, because the electron moves opposite to the direction of the field.
c. Joanna, because the electron moves in the direction of the field.
d. Sonya, because the electron moves in the direction of the field.
e. Neither, because the kinetic energy increases while the electron moves to a point at a higher potential.
e
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Pulsars:
A) spin very rapidly when they're young. B) are the cause of gamma-ray bursts. C) spin very slowly when they're young, and gradually spin faster as they age. D) generally form from 25 solar mass stars. E) emit radio in all directions.
The amount of light from an incandescent lamp that is transmitted through an ideal Polaroid filter is half, and through a classroom Polaroid filter is
A) less than half. B) more than half. C) half.
The half-life of a radioactive substance is affected by
A) pressure. B) temperature. C) age. D) all of the above E) none of the above
If more field lines leave a closed surface than enter that surface, then
A. a net positive charge is contained inside the surface. B. a net negative charge is contained inside the surface. C. an error has been made since the number of field lines entering a surface must equal those leaving the surface. D. an operating electron gun is inside the surface. E. there must be a charge on the surface.