A 12.6-F isolated capacitor is constructed with Teflon, having a ...

[berenicecastro]

A 12.6-F isolated capacitor is constructed with Teflon, having a dielectric constant of 2.1, between the plates. The capacitor is initially charged to 1.5 volts, and then the Teflon is removed.
 
  (a) How much excess charge was originally stored on the plates of the capacitor? (b) After removing the Teflon, what is the potential difference across the capacitor plates?

Question 2

The work function of a certain metal is 1.90 eV.
 
  What is the longest wavelength of light that can cause photoelectron emission from this metal? (1 eV = 1.60  10-19 J, c = 3.00  108 m/s, h = 6.626  10-34 J  s)
  A) 62.4 nm B) 14.0 nm C) 344 nm D) 654 nm E) 231 nm

[jomama]

Answer to Question 1

(a) 19 C (b) 3.2 V

Answer to Question 2

D

[berenicecastro]

TYSM

[ryhom]

Excellent