brief notes: modern physics lab 13 wave nature of em

Spring 2021 Modern Physics Lab 13 Wave Nature of EM Spectrum Brief-Notes: 9 pages. Aug 10, 2020

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Brief Notes: Modern Physics Lab 13 Wave Nature of EM Spectrum S21-with data Before lab: Read and follow the Labs General Notes instructions, especially about cleaning and disinfecting equipment before starting the lab and at the end. You should watch Lab13video(15:38min)(TurnCConforCaptions)–notethatthisvideodoesnotshowhowtousethemicroscopehttps://www.youtube.com/watch?v=X61G_CH5Pw8

. Read the lab manual and the Lab Brief-Notes which includes photos of apparatus and sample data. Do the prelab assignment and upload to blackboard. In lab: Bring the printed manual, a copy of the completed prelab assignment and these Brief-Notes to lab. Bring a laptop: You may want to replay parts of the video in lab Lasers are used in Part 1, and microwaves are used in Part 2. 1. Note that even if it is just a class II laser, it has the potential to damage your eyes (not

instantly), so be careful. 2. Know how to measure the slit separation using the microscope. Also how to turn on the

backlight of the table for microscope. 3. Students are allowed to write down whatever they want on the screen, since it is very difficult

or even impossible to measure an accurate fringes separation while the laser is still on. There are new grid papers on the counter.

4. Make sure you know which is the microwave detector and which is the receiver. Sometimes students are confused between these two.

5. Make sure to choose the proper size for the slits for the microwave. The wavelength of the microwave is about 3 cm, hence the size of the slit should be smaller than the wavelength so the interference pattern can be observed. A slit width set to 1.5 cm will work fine.

6. Since there are not enough microwave experiment set ups, students need to take turns in using the set ups. Therefore some students should do the second part of the experiment first.

7. We have devices which use two conventions of vernier scale in the lab. Some microscope uses the convention that you have to multiply the scale before add the last digits, while some you don’t need to. Make sure you use the correct convention for your setup, and ask the TA if there is confusion.


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Experiment #13: Wave Nature of EM Spectrum PHY123

Materials List: o Screen board o Laser o Grating holder o 3 lengths of track o Light bulb o Microscope o Box: Slits, mesh, grating o Microwave generator o Magnetic place holder o Microwave receiver o Rotating ruler o Box: Calipers Setup Notes: o Plug in microwave, Turn on Red Light to check operable, Rotate to test gauge o **Keep power UNPLUGGED o Plug in laser, turn on/off to test laser beam o Tack Grid Sheet on Peg board (cabinet in front of lab room) o Test light box, leave plugged in

Box: Slits, mesh, grating Grating Holder

Microscope Light bulb

2 lengths of

Track

Laser

Screen Board

Rotating Ruler

Microwave Receiver

Magnetic Place holder

Microwave generator

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1 length of Track


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Diffraction grating pattern

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One slit pattern

Microwave two slit experiment Slits 1.5 cm wide

Microwave Transmitter

Microwave Detector


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Modern Experiment #13: Wave Nature of Electromagnetic Spectrum Data Collection S18-12-A


One slit pattern


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Microwave Transmitter Microwave Detector

Microwave two slit experiment Slits 1.5 cm wide


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Modern Experiment #13: Wave Nature of Electromagnetic Spectrum Data Collection S11-13-A (ALTERNATE)


One slit pattern


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Microwave two slit experiment

brief notes: modern physics lab 13 wave nature of em

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