A metal has a work function of 4.50 eV. Find the maximum ...

[khang]

A metal has a work function of 4.50 eV.
 
  Find the maximum kinetic energy of the photoelectrons if light of wavelength 250 nm shines on the metal. (1 eV = 1.60  10-19 J, c = 3.00  108 m/s, h = 6.626  10-34 J  s)
  A) 0.53 eV B) 0.00 eV C) 0.37 eV D) 0.47 eV

Question 2

A charged particle is observed traveling in a circular path of radius R in a uniform magnetic field. If the particle were traveling twice as fast, the radius of the circular path would be
 
  A) R/2. B) 8R. C) R/4. D) 4R. E) 2R.

[nguyenhoanhat]

Answer to Question 1

D

Answer to Question 2

E

[khang]

Thanks

[nguyenhoanhat]

Welcome