Wavelength, Frequency, Energy, Speed, Amplitude, Period Equations & Formulas - Chemistry & Physics

This chemistry and physics video tutorial focuses on electromagnetic waves. It shows you how to calculate the wavelength, period, frequency, and amplitude of a wave directly from sinusoidal or sine wave graph. This video contains plenty of notes, equations / formulas, examples, and practice problems.
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Here is a list of topics:
1. How to calculate the wavelength of a wave in meters using a graph
2. Inverse relationship of period and frequency
3. Wavelength - the length of a cycle
4. Period is the time it takes a wave to complete a single cycle
5. Frequency is the number of cycles that a wave completes in a single second
6. Units of Frequency - Hz
7. Determining the Amplitude Using the Maximum and Minimum points of a graph.
8. Trough vs Crest of a wave
9. Speed of light Formula of a EM wave in a vacuum and in a material such as water, glass, or diamond
10. Index of refraction, speed of light, and wavelength
11. Frequency of light remains the same
12. Energy of a photon, frequency and planck's constant formula
13. Converting Joules of Energy into Electron Volts eV
14. Electromagnetic Spectrum Chart
15. Infrared, Radio waves, microwaves, roygbiv, ultraviolet UV radiation, x-rays, gamma rays, and cosmic radiation
16. Longest to Shortest Wavelength - Radiowaves to Cosmic Rays
17. EM Spectrum in order of increasing energy and frequency
18. Visible light spectrum wavelength range - color chart diagram - 400nm to 700nm
19. Red, Orange, Yellow, Green, Blue, Indigo, and Violet.
Disclaimer: Some of the links associated with this video may generate affiliate commissions on my behalf. As an amazon associate, I earn from qualifying purchases that you may make through such affiliate links.

[@TheOrganicChemistryTutor]

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you mixed up the position of the crest and the trough

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The Organic Chemistry Tutor 0:58

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Shaun Zulu I was just about to comment the same thing. Crest is on top. Trough is on the bottom.

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crest and trough, he switched them somehow

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[@Andrenium_89]

13:30 you can also count the number of oscillations (cycles) divided by the time . Like there is 1¾ cycles in the wave to 14 seconds.what about one cycles 1¾->14s 1 1x14 ÷7/4 14×4 =56 56÷7 = 8

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[@mekahfagan4012]

The crest should be at the top where the 5 is because the crest is the highest point the medium rises to and the trough should be at -5 because that is the lowest point the medium drops to so you made a small error there at 0:50 in the video but otherwise you provided a good explanation! 👍😀

[@lukekotze7837]

Amplitude above x-value = 0 is a crest. Amplitude below x-value = 0 is a trough.

[@caroltamez6798]

I have around 3500 data points that create a wave. My task is to detect the maximum range of the wavelenght, so basically the largest distance from the crest to the trough and since my wave is pretty irregular I was wondering if there is a method to calculate and detect it. Take into account that between the crest and the trough there are also points (values) that I would of course exclude since they are not my crest nor my trough point.

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isn't the crest the maximum peak, and the trough the minimum peak though?

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Well for a transverse progressive wave, the crest supposes to be at the top of the trough.

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Here in England it is the crest that is at the highest point on a wave and the trough at the lowest point.

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[@kabouch]

6:35This is the definition of the time period since wavelength is the spatial period of a wave.

[@brandonbennett4970]

Please correct me if I’m wrong (as I am only 12 and am not learning this in science) but isn’t the crest the top peak and the trough the bottom valley. And also I’m pretty sure that frequency is represented as f, not v. v is velocity.

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Hallo i just wanted to inquire on why we should break down the wave at 13:45

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Do you have videos on snapshot graphs and history graphs or periodic waves and their displacement moving right and left ? Thanks

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In our science the trough is under the equilibrium and the crest is above in equilibrium

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[@derekjoshua1127]

Very good video once again from @Organic chemistry tutor But you mixed up the positions of the crest ans trough The crest is the up one While the trough is the down one

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I thought trough is at the bottom and crest is top. 😳

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[@itrstt66]

if the frequency is cycles over second, then the cycles are second times frequecy. f= cy./1 cy.= 1*f if wavelength is distance over cycles then the cycles are distance over wavelength. λ = m/cy. cy.= m/λ So this produces the equation: 1*f = m/λ; if that is so, the both ratios between 1 and f as well as m and λ are the same if you change the wavelength you change one ratio of the equation and the other has to change as well, now if the wavelength changes and the frequency doesnt, it can only change the time for the given cycles of the frequency to fit in a second??? I can't understand this. Could you help me understand it? because the time for the cycles fit into a second is the second and if the time - the second - changes for other value than a second it will influence the frequency by means of influencing the cycles value...

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The trough is at the down and crest is in the up.

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[@kabouch]

Please, what kind of Energy(potential or kinetic) do you say it decreases with wavelength?15:05

[@QariSaab69]

My Bro got a bit confused there with the Crest and Trough

[@ts37924]

is wavelenght inversly proportional to frequency only when amplitude is fixed. and is amplitude inversley proportinal to frequency only when wave length is fixed or can vary only upto given extent, does the amplitude of light decrease with increase in frequency?

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Yes sir I thought that the crest is above whiles the trough is below

[@Aero2992]

Great Video, however one bit of question.... I believe your Crest and Trough may be backwards. The lowest I believe is the Trough, and the Highest is the Crest ?

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i came here immediately after seeing The upper part is called the troughs 😑

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Clear explanation Thank you❤