What happens to an electron's wave packet if an accurate velocity ...

[cnetterville]

What happens to an electron's wave packet if an accurate velocity measurement is performed?
 
  A) It suddenly changes to a new wave packet having a very small uncertainty in position, but a large uncertainty in velocity.
  B) It suddenly changes to a new wave packet having a very small uncertainty in velocity, but a large uncertainty in position.
  C) It suddenly changes to a new wave packet having small uncertainties in both velocity and position.
  D) Neither the wave packet nor the electron is affected by the measurement.
  E) The wave packet is unaffected by the measurement, even though the electron itself makes a sudden change of state that is caused by the measurement.

Question 2

A particle in a 453 m-long linear particle accelerator is moving at 0.875c. How long does the particle accelerator appear to the particle?
 
  A) 219 m
  B) 589 m
  C) 104 m
  D) 936 m

[Awesome]

Answer to Question 1

B

Answer to Question 2

A

[cnetterville]

Thanks for the timely response, appreciate it

[smrtceo]

Wow, this really help