The de Broglie wavelength of an electron is 380 nm. What is the ...

[vHAUNG6011]

The de Broglie wavelength of an electron is 380 nm. What is the speed of this electron?
 
  A) 2.04  103 m/s
  B) 3.83  103 m/s
  C) 1.92  103 m/s
  D) 4.12  103 m/s
  E) 5.22  103 m/s

Question 2

A light ray enters a glass enclosed fish tank. From air it enters the glass at 20. with respect to the surface, then emerges into the water. The index for glass is 1.50 and for water 1.33.
 
  (a) What is the angle of refraction in the glass? (b) What is the angle of refraction in the water? (c) Is there any incident angle in air for which the ray will not enter the water due to total internal reflection?

[emsimon14]

Answer to Question 1

C

Answer to Question 2

(a) 39.
(b) 45.
(c) no

[vHAUNG6011]

Excellent

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