A proton falls through a potential drop of 400 V. How much is the ...

[abern]

A proton falls through a potential drop of 400 V. How much is the change of potential energy of this proton in falling through this potential drop?
 
  A) 6.4  10-16 J
  B) -6.4  10-16 J
  C) 17  10-16 J
  D) -4000 J
  E) 4000 J

Question 2

Which of the following is the correct equation for the momentum of a photon?
 
  A) p = (hc)/
  B) p = /c
  C) p = (hc)/f
  D) p = (hf)/c
  E) p = (h)/c

[CAPTAINAMERICA]

Answer to Question 1

B

Answer to Question 2

D

[abern]

TYSM

[tranoy]

Thanks for the timely response, appreciate it