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

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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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Опубликовано:

8 ноя 2016

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Комментарии : 60

@hrishiv 2 года назад

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 года назад

Ur the free science lessons guy for a level physics

@silrana7166 4 года назад

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

@abualasif 4 года назад

lol fr

@herantd 6 лет назад

The best explanation out there!

@aletheabarretto3624 6 лет назад

Exactly!!! I was so confused before

@TigerSHe 7 лет назад

really nice video, explainations are on point! thanks!

@Opls0707 Год назад

Best explanation of Diffraction Grating !

@aletheabarretto3624 6 лет назад

a blessing to my life

@minxxdia1132 4 года назад

explained everything, thankyou!

@TheCitygear 2 года назад

아주 깔끔한 설명! Good!

@asmitaroy2243 6 лет назад

thank you this really helped

@riazrabia Год назад

Great explanation 👏😍 Thanks alot

@FernandoMoreiraR 14 дней назад

great summary!!

@iccyt2780 2 года назад

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

@Ashraf-Chowdhury 3 года назад

Best one out there

@AnthonyMoody 4 года назад

great vid!

@barkley2824 3 года назад

what's his brand of pen that ink looking neat

@laylaalghizzi1391 4 года назад

that was really helpful, thank you :->

@PhysicsOnline 4 года назад

You're welcome!

@gayandesilva3180 2 года назад

Thank you

@jashanpreet863 6 лет назад

What would the variables be for this?

@PhysicsOnline 6 лет назад

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.

@AnandKumar-nq3wp 2 года назад

Thanks

@pkbharti460 2 года назад

sir theory main mil sakta hai'

@samuelmathieson249 3 года назад

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 года назад

god is good god is great

@lucyjo2331 7 лет назад

I love those pens what are they???

@PhysicsOnline 7 лет назад

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.

@TheChristianOrthodox 6 лет назад

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

@mifi368 4 года назад

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 Месяц назад

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.

@shayhan6227 5 лет назад

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.

@canadianbro9327 5 лет назад

d is the what?

@samsonfisher4578 5 лет назад

2:05

@christinaholm3789 Месяц назад

Didnt explain if h1, h2 and h3 have different lengths

@KyserMontalvoC 6 лет назад

whats d?

@rishi_d_mango 6 лет назад

Kyser Montalvo width of the slit

@zaiiify8689 6 лет назад

The split separation

@lukemcellin8736 3 года назад

All bow down to our lord and savour

@usmanahmed6663 Год назад

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

@PhysicsOnline Год назад

Have a look here: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-L1WMvTiAt4E.html

@baptistedoyon4110 7 месяцев назад

What is d in the formula?

@ilysmjac 2 месяца назад

reciprocal of the lines per metre (N) of the diffraction grating used -- so 1/N

@momi5656 7 лет назад

plz there are a demonstration of " nh=dsino " ?? and thank you :-)

@avtaras 4 года назад

Wtf man just copy Greek letters to your clipboard This is absolutely shambles

@imperialrecker7111 4 года назад

@@avtaras lol dsino 😂

@greeneggsandham7950 4 года назад

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

@joea-497kviews2 4 года назад

green eggs and ham same here

@AnthonyMoody 4 года назад

lets sue him!

@rahilsiddique6950 3 года назад

not all heroes wear cap thanks a lot !!

@jaankhokhar 4 года назад

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.