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.
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[@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! 👍😀

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

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bro you messed up the trough and crest of the wave. the top os called the crest and the bottom is called the trough. But thank you we got it

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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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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 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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13:27 8!!! Edit for 14:25 I sumed up half cycles. There are 7 half cycle. 14/7 half cycle is 2 sec. 4 half cycle is 8 sec.

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

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9:46 isn't it supposed to be two seconds per cycle instead of two cycles per second, or have I misunderstood something?

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

[@adharwalia2280]

Excuse me - Another mistake that was not pointed out: wavelength is from crest to crest, not from the beginning to the end of the cycle. At 1:24, you incorrectly state that the wavelength is the length of one cycle.

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Plz correct the error that u made at 1:07 crest is at the top and trough is at the bottom....plz resolve it .....this can confuse students even I was confused for a while .....

[@Martin_Z555]

at 0:52 you say that the peak is called the trugh, and the bottom is the crest. that's wrong. its the other way around.

[@tarnishedanachronism4914]

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

[@calvinjackson8110]

Nice explanation and I like your examples. Just recheck your concept of Crest and trough.

[@c.bhavazna5447]

I'm sorry to tell,but isnt the crest the high point and trough -the low point? Just check out at 0:59 !You interchanged the positions

[@faisalmohamed4595]

13:57 at this question we have two circles with 14 seconds so the period T=7s not 8s my brother

[@dogwithwigwamz.7320]

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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this math looks like Erwin Schrödinger math Equation But different still like it.

[@phelliskepler2868]

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

[@michaelgalario6655]

When we talk about cycles, we are talking about repetition right? One cycle is one complete wave. Waves is defined as a continuous and repeating disturbance. Question, why do we count the incomplete cycle which is not repeated in your example? Shouldn't it be only 3 cycles instead? I used to think before that we could count the half part. I tried searching and reading books and websites but could not find any article explaining if the half wave should be counted or not. Sticking onto the definition of frequency, it says" frequency refers to the number of cycles occurring per second". Here again, it talks about cycles, and if we talk about cycle, we are talking about one complete revolution, and that is equivalent to 360 degrees, which is equivalent to one crest and one trough. Hope you could shed light on this. Thanks!

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