Final%20exam:%2050%20questions%20(200%20points%20total)

1
Final exam 50 questions (200 points total)
Interference Patterns (2-pt, gratings, diffraction
)
Lenses, Telescopes/ Microscopes
Thin films, Refraction
Relativity
(EM) Circuits EB fields
2
d
v
Frame B
d ctB
vtA
Frame A
ctB
vtA
3
How long, according to our frame of reference,
does 1 second spent on board a traveling frame
really last if
if v0.50c? if v0.70c? if v0.999c?
1.155 sec 1.4 second 22.355 sec
What happens as the frame approaches light speed?
4
Unstable subatomic particles
muon lifetime mlifetime 2.197msec (at
rest) pion lifetime p0lifetime
8.4?10-17sec pion lifetime p?lifetime
2.6?10-8sec neutron lifetime nlifetime 887
sec14.78min
ct 658.644 meters
in addition to numerous radioactive isotopes,
have all been demonstrated to dramatically
increase their lifetimes when accelerated into
high energy beams.
5
A Trip to Alpha Centauri
our nearest star, roughly 4 light-years away
Flight Plan (Earth frame) Departure A.D. 1
Jan 2010 ETA A.D. 1 Jan 2019
Takes a few days of continuous acceleration to
reach v c
2 Jan 2010 3 Jan 2010 4 Jan 2010
6
v 0.500c
A 100 meter length spacecraft (as speced at its
manufacturing plant) passes by with a speed of
0.500c. What is its observed length as it
passes overhead?