spectroscopy explained - with Crooked Science and USyd Kickstart

[@jayronfinan]

Sir, you have a gift for teaching! As a former teacher and homeschooling mom of budding future scientists, I've spent the last few weeks scouring books and KZbin trying to teach myself about spectroscopy. Hands down, this video is by far the best. I'd like to thank you! I am just confused about one section. At the 8:29 mark you introduce a spectrum of the sun with (what I believe are Fraunhofer lines) but I don't understand how the sun can be both a continuous spectrum (gives all visible light) and the pictures at 8:29 and you say our sun "is an absorption spectrum." Internet searches seem to say "In summary, the spectrum of the sun is both continuous and absorption. The source itself is continuous, but as it passes through the outer layers of the sun, it becomes partially absorbed, resulting in an absorption spectrum." Would you agree with this?

[@PhysicsHigh]

Thanks for your feedback. I’m glad my videos are useful. Yes I agree with that statement. I was referring to the sunlight that we received which is definitely an absorption spectrum, but as the text noted, the energy from the son’s core has to pass through the atmosphere come. God bless.

[@jayronfinan]

Thank you so much for the reply! Next, I'm going to try and understand the difference between spontaneous and stimulated emission and was delighted to learn you have a video on lasers. @@PhysicsHigh

[@sharonsolana]

Thank you for making this video!

[@divermike8943]

This video doesn't explain WHY you are measure angle of the table spectrometer. I've played that part multiple times. d sin(theta)=m* Lamdi. So I conclude it is to measure the angle theta to solve for lamda and get the exact wavelength. But as a teaching video you should not have stipped that explaination.

[@h7opolo]

5:59 gross concept error: our eyes are limited to activation by only three different wavelength intensities, i.e. red, blue, and green. the "visible" spectrum is just a trick, and we don't actually know which color corresponds to various wavelengths. we painted a false picture on a black and white mystery, until chemical sensors, aka photographic film, was made. even then, the colored rays corresponding to pure orange, yellow, purple, etc. will only appear as grey tones on the film.

[@h7opolo]

"There ain't no rainbows shining on me, Shades of grey are the colors I see" - Billy Joel "Shades of Grey" (1994)

[@cdorman11]

@4:20 I can't find any support that diffraction is what's behind the rainbow colors of soap bubbles. It's rather thin-film interference. It's not a matter of a small obstacle deviating light slightly from its straight path but rather a combination of reflection off two surfaces and constructive/destructive interference--leading to our preferentially seeing some frequencies over others. wired dot com/story/the-secret-to-soap-bubbles-iridescent-rainbows/ explainthatstuff dot com/thin-film-interference.html

[@PhysicsHigh]

I stand corrected. Thanks. I plan to make a video on soap bubbles and will ensure correct language.

[@nilanadesilva1012]

When a beam of white light strikes a triangular prism it is separated into its various components (ROYGBIV). This is known as a spectrum. The optical system which allows production and viewing of the spectrum is called a spectroscope. There are many other forms of light which are not visible to the human eye and spectroscopy is extended to cover all these.

[@sharonsolana]

Thank you

[@ffelegal]

The fact developed countries have these machines in high schools is mind blowing for me.

[@h7opolo]

how do we dare feign to accurately assign colors to wavelengths within the "visible spectrum" we can't directly perceive??? 10:20 is there some inference or extrapolation or Fourier transform of sorts to prove our assignment is remotely correct? is it proven by wave interference theory?

[@ThePoshboy1]

Thanks for the video, I may have graduated from Highschool, but these videos are certainly good for revision.

[@deni5846]

Спасибо за доступное объяснение материала! Я из России. Жаль, что на русскоговорящей площадке мне не удалось найти стоящего контента, связанного с этой темой.

[@kujirakan9537]

best video in the topic of SPECTROSCOPY

[@군주-b9v]

Johnson Michelle Clark Patricia Williams John

[@omsingharjit]

Do glass of hydrogen emission tube not interfere with lines because glass itself made of something so it should also absorbs or emit some wavelength of light ?

[@C-delaC]

[@bimmjim]

Excellent. I'm going to try some of these experiments with m camera.

[@donegal79]

very good, thank you! I think i used the same spectroscope in high school in 1984...that one ain't new :-)

[@ukz9350]

ممكن ترجمة المقطع للغة العربية

[@justinejacob6369]

Brilliant. Thank you for this.

[@bienvenuquentingounoumound5342]

That is a pretty clear explanation of spectroscopy. I remember many physics notions.

[@user-mj3ef]

How is such a coherent white light source shown in this video is produced for long distance gas identification spectroscopy?

[@Hambxne]

well done! not sure if you take questions but i was just wondering why glass absorbs UVB light but allows visible light to be passed through it?

[@lalala987]

Great video tnx! Is there a chance to get a hold of your amazing slides? I'd like to cite them in a workshop for some friends. Full credits would be given of course.

[@PhysicsHigh]

Sure. Just email me.

[@lalala987]

@@PhysicsHigh tnx a lot, i used the form on your site :) greetings from austria!

[@225rip]

Great job guys.

[@fredgassit5418]

Excellent job, thank you!

[@PhysicsHigh]

Thanks

[@matthewku4563]

anyone here from mr gengiah's physics class?

[@ashafaghi]

Your videos are first class, thank you!!!

[@PhysicsHigh]

You're very welcome!

[@wnbrook4220]

10:44 is Eagle Nebula not the Helix Nebula lol

[@PhysicsHigh]

Oops. Misspoke. You are right.

[@pauleohl]

If this level of introduction and explanation is typical of current high school practice, then it is no wonder that the students are lost. You tried to pack too much info into 21 minutes and wound up with a waste of time.