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unkindnesskindUrban and Civil

Nov 15, 2013 (3 years and 9 months ago)

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Physics 145

Introduction to Experimental Physics I





Instructor:
Karine

Chesnel


Office: N319 ESC

Tel: 801
-

422
-
5687


kchesnel@byu.edu

Office hours: on appointment





Class website:



http://www.physics.byu.edu/faculty/chesnel/physics145.aspx

Lab space availability

Wednesday 3


6 pm:


3 seats

Thursday 8


11 am:


1 seat

Thursday 11 am


2 pm:

1 seat

Thursday 3


6 pm:


-

Friday 11am


2 pm:


9 seats

Friday 2


5 pm:


-

Your lab assignments

1.
Prepare by reading the introduction material

2.
Answer quiz questions (within the first half hour) and
submit the sheet to your TA

3.
Proceed to the experiments: L2.1, L2.2, etc…

4.
Write a report of your findings for each experiment,
in your lab notebook (individual reports)


Lab
3

Interference

Diffraction


Interferences

Constructive


interference

Destructive


interference

Adding waves:

Difference in optical path:



=
𝑑𝑠𝑖𝑛𝜃

=
𝑛
𝑛
+
1
2

l

l

constructive

destructive

Interferences & diffraction

Single slit

Diffraction pattern

Interferences & diffraction

Double slits

Diffraction pattern

Interferences & diffraction

Double slits

Peak separation

Slits separation

Envelope width

(separation between maxima)

Slits width

Interferences & diffraction

Double slits

Single slit

Interferences & diffraction

Double slits

Five slits

Interferences & diffraction

Grating

Zero order

first order

first order

second order

second order

Lab
3: Interference & Diffraction

A.
Alignment


L3.
1:
Vertical alignment (posts)


L3.2: Horizontal alignment (bench)


L3.3: Lenses positioning (collimation, focalization)


L3.4: Source


eyepiece alignment

B
. Qualitative observations


L3.5
:
Green filter


Single slit, varying size


L3.6: Try different filters, optimize color


L3.7
:
Double
-
slits, varying spacing


L3.8
:
Grating: compare intensity, resolution

C
. Quantitative measurement


L3.9
:
Use diffraction pattern from the grating


to determine the wavelength of the light

Lab 2: spectroscopy