Light of wavelength 400 nm falls on a metal surface having a work ...

[renzo156]

Light of wavelength 400 nm falls on a metal surface having a work function 1.70 eV.
 
  What is the maximum kinetic energy of the photoelectrons emitted from the metal? (c = 3.00  108 m/s, h = 6.626  10-34 J  s = 4.141  10-15 ev  s, 1 eV = 1.60  10-19 J)
  A) 1.41 eV B) 1.70 eV C) 3.11 eV D) 2.82 eV E) 4.52 eV

Question 2

An object is placed 10 cm from a convex lens with a focal length of magnitude 20 cm. What is the magnification?
 
  A) -2.0 B) 0.50 C) 1.5 D) 2.0 E) -2.5

[Beatricemm]

Answer to Question 1

A

Answer to Question 2

D