Measuring Wavelength of Light with a Diffraction Grating - PRACTICAL

Measuring Wavelength of Light with a Diffraction Grating - PRACTICAL - A Level Physics

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7 жыл бұрын

In this video I go through an AQA Physics A Level Required Practical that uses a diffraction grating experiment to investigate the properties and to measure the wavelength of light. (This is AQA Required Practical 2.) This is also the OCR A Level Physics PAG 5.1 Practical.
A laser will diffract and interfere when shone through a diffraction grating. The distance to the first, second and third order maxima can be measured which will then allow the wavelength of the light to be calculated. Be careful with the laser. Do not look at the beam or any reflected light from a shiny surface.
See instructions for all the practicals at www.alevelphysicsonline.com/ye...
Thanks for watching,
Lewis
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Пікірлер: 60

@hrishiv 2 жыл бұрын

A point for anyone reading this in future, the d in the formula is the distance between the lines in the grating, the D used to find the angle is the distance from the grating to the screen, same as in the Double Slit experiment - this is why I tend to use L to denote the distance to the screen, due to the clash in letters.

@lukemcellin8736 3 жыл бұрын

Ur the free science lessons guy for a level physics

@silrana7166 4 жыл бұрын

"Thank you," Me: *No, thank you my saviour*

@abualasif 4 жыл бұрын

lol fr

@herantd 6 жыл бұрын

The best explanation out there!

@aletheabarretto3624 6 жыл бұрын

Exactly!!! I was so confused before

@TigerSHe 7 жыл бұрын

really nice video, explainations are on point! thanks!

@Opls0707 Жыл бұрын

Best explanation of Diffraction Grating !

@aletheabarretto3624 6 жыл бұрын

a blessing to my life

@minxxdia1132 4 жыл бұрын

explained everything, thankyou!

@TheCitygear 2 жыл бұрын

아주 깔끔한 설명! Good!

@asmitaroy2243 6 жыл бұрын

thank you this really helped

@FernandoMoreiraR 3 күн бұрын

great summary!!

@iccyt2780 2 жыл бұрын

When finding the mean value, do I divide the second order by 2

@riazrabia Жыл бұрын

Great explanation 👏😍 Thanks alot

@barkley2824 3 жыл бұрын

what's his brand of pen that ink looking neat

@laylaalghizzi1391 4 жыл бұрын

that was really helpful, thank you :->

@PhysicsOnline 4 жыл бұрын

You're welcome!

@Blank.001 3 жыл бұрын

Best one out there

@gayandesilva3180 2 жыл бұрын

Thank you

@AnthonyMoody 4 жыл бұрын

great vid!

@shayhan6227 5 жыл бұрын

This is nice and all but how in the heck did humanity create precision diffraction gratings to get precision measurements of the wavelengths from? This is a like a catch 22 paradox of science history.

@pkbharti460 2 жыл бұрын

sir theory main mil sakta hai'

@AnandKumar-nq3wp 2 жыл бұрын

Thanks

@jashanpreet863 6 жыл бұрын

What would the variables be for this?

@PhysicsOnline 6 жыл бұрын

You could try it with different colour lasers, or perhaps keep the same colour laser and move the screen a different distance away each time.

@samuelmathieson249 3 жыл бұрын

hey guys I am a bit dum and kinda need to do a rightup for this thing and can somone help me find what the Independent Variables Dependent Variables Controlled Variables are any help is appreciated =)

@alexandrucoca9770 2 жыл бұрын

god is good god is great

@greeneggsandham7950 4 жыл бұрын

I looked into the laser beam and I'm blind in one eye, you could of told us....

@joea-497kviews2 4 жыл бұрын

green eggs and ham same here

@AnthonyMoody 4 жыл бұрын

lets sue him!

@TheChristianOrthodox 6 жыл бұрын

Can we measure a height of an object using this theory by adding all h1, h2....

@mifi368 4 жыл бұрын

Abeba k Haile you could just take a angle measuring apparatus and point at the object from ground to get the angle, then measure the ground distance from the apparatus to the object the calculate for height of object using tan. Best for larger objects like buildings.

@christinaholm3789 Ай бұрын

If you dont have an apparatus, what about just throwing a stone from the roof to calculate the height, however might come with certain false marginals. I know that laser apparatus calculates the time back the laser reflects to it's sensors or something in that area, but then I wonder how does the apparatus prevent the reflection of getting another angle when it for example hits the wall?. Do they put a mirror at the wall or something set to the same angle?, but that might be rather dangerous.

@christinaholm3789 Ай бұрын

Didnt explain if h1, h2 and h3 have different lengths

@usmanahmed6663 Жыл бұрын

Why we are using dsin@ instead of 2dsin@ . what is the logic behind This explain please 🥺

@PhysicsOnline Жыл бұрын

Have a look here: kzfaq.info/get/bejne/gpeHgNmFzqfYZHk.html

@lukemcellin8736 3 жыл бұрын

All bow down to our lord and savour

@canadianbro9327 5 жыл бұрын

d is the what?

@samsonfisher4578 5 жыл бұрын

2:05

@lucyjo2331 7 жыл бұрын

I love those pens what are they???

@PhysicsOnline 7 жыл бұрын

Pilot V-Sign pens in medium - slightly too thick to make normal notes with but I've been very happy with them for these videos.

@jaankhokhar 4 жыл бұрын

URGENT!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! I cant do the practicals in school and the results from my classmates are not available. What other way is there of finding that data without doing the experiment.

@toffeesky6227 3 жыл бұрын

make it up lol

@kemiosuide313 2 жыл бұрын

you could do it at home, you can find all sorts of science equipment online