Frequency, Wavelength, and the Speed of Light

This video describes what frequency is, how it is measured, how frequency and wavelength are related visually and mathematically, and derives the mathematical relationship between frequency, wavelength, and the speed of light

—More on Light | Wikipedia—
"Light is electromagnetic radiation within a certain portion of the electromagnetic spectrum. The word usually refers to visible light, which is visible to the human eye and is responsible for the sense of sight.[1] Visible light is usually defined as having wavelengths in the range of 400–700 nanometres (nm), or 4.00 × 10−7 to 7.00 × 10−7 m, between the infrared (with longer wavelengths) and the ultraviolet (with shorter wavelengths).[2][3] This wavelength means a frequency range of roughly 430–750 terahertz (THz).

The main source of light on Earth is the Sun. Sunlight provides the energy that green plants use to create sugars mostly in the form of starches, which release energy into the living things that digest them. This process of photosynthesis provides virtually all the energy used by living things. Historically, another important source of light for humans has been fire, from ancient campfires to modern kerosene lamps. With the development of electric lights and power systems, electric lighting has effectively replaced firelight. Some species of animals generate their own light, a process called bioluminescence. For example, fireflies use light to locate mates, and vampire squids use it to hide themselves from prey.

The primary properties of visible light are intensity, propagation direction, frequency or wavelength spectrum, and polarization, while its speed in a vacuum, 299,792,458 metres per second, is one of the fundamental constants of nature. Visible light, as with all types of electromagnetic radiation (EMR), is experimentally found to always move at this speed in a vacuum.[citation needed]

In physics, the term light sometimes refers to electromagnetic radiation of any wavelength, whether visible or not.[4][5] In this sense, gamma rays, X-rays, microwaves and radio waves are also light. Like all types of light, visible light is emitted and absorbed in tiny "packets" called photons and exhibits properties of both waves and particles. This property is referred to as the wave–particle duality. The study of light, known as optics, is an important research area in modern physics."

Wikipedia contributors. "Light." Wikipedia, The Free Encyclopedia. Wikipedia, The Free Encyclopedia, 5 Jun. 2016. Web. 18 Jun. 2016.

[PrachiPurva]

Being a chemistry teacher, m just amazed after watching this. This is just superb.

[upaste]

an excellent and clear explanation with good graphics and slow speaking. 10/10

[srishti]

i usually never comment on any youtube videos but i am literally thankful to you sir cause i was really frustrated with this topic and my exams are around corner 😇

[wendyplotkin]

I have been searching for over 50 years for an explanation of simple wave characteristics that would open up the rest of physics to me.

This presentation has achieved that.

I am so, so grateful for this experience and can barely restrain my excitement in hoping that the other videos will do the same.

Fine teaching is among the greatest gifts one human being can give another!

[joeljosh]

Sir, by your teaching I was able to understand the concept of "Frequency, Wavelength, and the Speed of Light".You are helping a lot of students with your video. Keep making such amazing videos.😇

[thinhtran-mike-]

You're doing such a great work for students. Thank you for making the video.

[johnberry]

Very interesting thank you,  I just need to watch it another 10 times to sink in... :)

[nazmisharif]

I'm Malaysian Citizen.. Proud with u to share the superb knowledge

[hudave]

Thank It was super super helpful and I got a test tomorrow so plz wish me good luck

[raiskassimibrahim]

This is the best video ever period. I wish everything science can be simplified like this !

[dilipdhage]

Best video
I Don't get such an explanation anywhere

[juanfelipe]

This is one of the best explanations I’ve ever watched

[nicolewhitman]

Dude! You just saved me! AMAZING LESSON! THANK YOU

[staceyshpaner]

I am forever grateful to you sir! At this exact moment, at 5:57 in the video, I FINALLY understood what is going on in my chemistry class.
Wavelength is METERS
Frequency is PER SECOND
Speed is METERS PER SECOND

[Kater]

This is exactly what I needed! Elegant and well-written, clear and concise...thanks a million <3

[vijayagurudas]

Fantabulous video and the best digramatic explanation of the concept.
As a student at present I am very fortunate to have seen this .
Thank you so much Sir😊👏🏿

[polyglot]

Thank you, so helpful. Needed a clear explanation of wavelength, frequency, and speed of light in order to study for ham radio exam and this helped.

[calvinf]

Nice video. I have a test tomorrow and part of it is on energy of radiation, and this made it so much clearer for me. Thanks, mate!

[sharmisthachakraborty]

Explanation is too good...made me understand the thing in no time..thx

[taskeentori]

Loved this video.Nice representation!👍