What length of a certain metal wire of diameter 0.15 mm is needed ...

[cagreen833]

What length of a certain metal wire of diameter 0.15 mm is needed for the wire to have a resistance of 15 ? The resistivity of this metal is 1.68  10-8   m.
 
  A) 16 mm
  B) 16 cm
  C) 1.6 m
  D) 16 m
  E) 160 m

Question 2

You want to confine an electron in a box (an infinite well) so that its ground state energy is 5.0  10-18 J.
 
  What should be the length of the box? (h = 6.626  10-34 J  s, mel = 9.11  10-31 kg)
  A) 0.11 nm
  B) 0.22 nm
  C) 0.15 nm
  D) 0.18 nm

[stillxalice]

Answer to Question 1

D

Answer to Question 2

A

[cagreen833]

Excellent

[debra928]

Thanks for the timely response, appreciate it