A photocathode whose work function is 2.5 eV is illuminated with ...

[melina_rosy]

A photocathode whose work function is 2.5 eV is illuminated with white light that has a continuous wavelength band from 360 nm to 700 nm. The stopping potential for this white light illumination is closest to:
 
  A) 0.94 V
  B) 0.85 V
  C) 1.0 V
  D) 1.1 V
  E) 1.2 V

Question 2

The power rating of a 400- resistor is 0.800 W. (a) What is the maximum voltage that can be applied across this resistor without damaging it? (b) What is the maximum current this resistor can draw without damaging it?
 
  What will be an ideal response?

[JYan]

Answer to Question 1

A

Answer to Question 2

(a) 17.9 V (b) 44.7 mA

[melina_rosy]

Wow, this really help

[helenmarkerine]

Thanks for the timely response, appreciate it