A nonrelativistic electron and a nonrelativistic proton have the ...

[Haya94]

A nonrelativistic electron and a nonrelativistic proton have the same de Broglie wavelength. Which of the following statements about these particles are accurate? (There may be more than one correct choice.)
 
  A) Both particles have the same speed.
  B) Both particles have the same kinetic energy.
  C) Both particles have the same momentum.
  D) The electron has more kinetic energy than the proton.
  E) The electron has more momentum than the proton.

Question 2

A perfectly black sphere 18.0 cm in diameter is held at a temperature of 215C. ( = 5.670  10-8 W/m2  K4, Wien displacement law constant is 2.90  10-3 m  K, h = 6.626  10-34 J  s, c = 3.00  108 m/s)
 
  (a) Near what wavelength does this sphere radiate most strongly?
  (b) If all the radiated energy were at the wavelength found in part (a), how many photons would the sphere emit each second?
  What will be an ideal response?

[Silverbeard98]

Answer to Question 1

Answer: C, D

Answer to Question 2

Answer: (a) 5.94 m (b) 9.79  1021 photons

[Haya94]

Great answer, keep it coming

[xiaomengxian]

Excellent