When you interchange your emitter for one with a smaller work ...

[skymedlock]

When you interchange your emitter for one with a smaller work function, you measure
  A. An increased current
  B. A decrease in the necessary stopping voltage
  C. An increase in the necessary stopping voltage
  D. No change in either current or stopping voltage
  E. Either a or c. You cannot determine which from the information given.

Question 2

When you increase only the frequency of the incoming light onto the emitter, you measure
 

A. An increased current
  B. A decrease in the necessary stopping voltage
  C. An increase in the necessary stopping voltage
  D. No change in either current or stopping voltage
  E. Either a or c. You cannot determine which from the information given.

[stillxalice]

Answer to Question 1

C.
Any changes in stopping voltage would change the necessary energy to bridge the emitter-collector gap. Since a current i is already established, the electrons could already get across, and with a decreased work function, the photons are greater in energy. An increase in the necessary stopping voltage would mean that just the most energetic electrons will bridge the gap

Answer to Question 2

Changes in stopping voltage change the necessary energy to bridge the emitter-collector gap. The increase in the frequency of light means that the ejected electrons have greater kinetic energy. An increase in the necessary stopping voltage would mean that the most energetic electronsthe new, higher energy electronswould bridge the gap. Since the increase in frequency will not free more electrons, the current should stay the same.
C.

[skymedlock]

TY

[stillxalice]

You're welcome