A metal surface has a work function of 1.50 eV. Calculate the ...

[joe]

A metal surface has a work function of 1.50 eV. Calculate the maximum kinetic energy, in eV, of electrons ejected from this surface by electromagnetic radiation of wavelength 311 nm.
 
  (c = 3.00  108 m/s, h = 6.626  10-34 J  s, e = - 1.60  10-19 C, 1 eV = 1.60  10-19 J)

Question 2

A conducting bar slides without friction on two parallel horizontal rails that are 50 cm apart and connected by a wire at one end. The resistance of the bar and the rails is constant and equal to 0.10 .
 
  A uniform magnetic field is perpendicular to the plane of the rails. A 0.080-N force parallel to the rails is required to keep the bar moving at a constant speed of 0.50 m/s. What is the magnitude of the magnetic field? A) 0.10 T
  B) 0.25 T
  C) 0.36 T
  D) 0.54 T
  E) 0.93 T

[blakeserpa]

Answer to Question 1

2.50 eV

Answer to Question 2

B

[joe]

Excellent

[laurnthompson]

TYSM