Light of wavelength 105 nm falls on a metal surface for which the ...

[swpotter12]

Light of wavelength 105 nm falls on a metal surface for which the work function is 5.00 eV.
 
  What is the minimum de Broglie wavelength of the photoelectrons emitted from this metal? (h = 6.626  10-34 J  s = 4.14  10-15 eV  s, c = 3.00  108 m/s, mel = 9.11  10-31 kg, 1 eV = 1.60  10-19 J)
  A) 0.66 nm B) 0.47 nm C) 0.24 nm D) 0.94 nm E) 0.33 nm

Question 2

A person throws a ball horizontally from the top of a building that is 24.0 m above the ground level. The ball lands 100 m down range from the base of the building. What was the initial velocity of the ball? Neglect air resistance and use g = 9.
 
  81 m/s2. A) 202 m/s
  B) 9.80 m/s
  C) 19.6 m/s
  D) 45.2 m/s
  E) 94.4

[Qarqy]

Answer to Question 1

B

Answer to Question 2

D

[swpotter12]

Thank you!

[Qarqy]

Always glad to help...