The electric field at point P due to a point charge Q a distance R away from P has magnitude E. In order to double the magnitude of the field at P, you could
A) double the distance to 2R.
B) double the charge to 2Q.
C) reduce the distance to R/2.
D) reduce the distance to R/4.
E) double the charge to 2Q and at the same time reduce the distance to R/2.
Question 2
A beam of light falling on a metal surface is causing electrons to be ejected from the surface. If we now double the frequency of the light, which of the following statements are correct? (There could be more than one correct choice.)
A) The kinetic energy of the ejected electrons doubles.
B) The speed of the ejected electrons doubles.
C) The number of electrons ejected per second doubles.
D) Twice as many photons hit the metal surface as before.
E) None of the above things occur.
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