A reflected ray of light leaves a plane mirror's surface at an ...

[krzymel]

A reflected ray of light leaves a plane mirror's surface at an angle of 60 relative to the normal. The angle of incidence was
 a. 60 relative to the surface.
  b. 60 relative to the normal.
  c. 90 from the surface.
  d. none of these.

Question 2

An electron has been accelerated by a potential difference of 100 V. If its position is known to have an uncertainty of 1 nm, what is the percent uncertainty (p/p  100) of the electron?
 a. 1
  b. 2
  c. 10
  d. >>10
  e. 5

[Perkypinki]

Answer to Question 1

b

Answer to Question 2

a

[krzymel]

Excellent

[juliaf]

TYSM