GOB Chemistry

Learn the toughest concepts covered in your GOB - General, Organic, and Biological Chemistry class with step-by-step video tutorials and practice problems.

Atoms and the Periodic Table

Electromagnetic Spectrum (Simplified)

The Electromagnetic Spectrum is the different forms of radioactive energy that exists in our universe.

What is the Electromagnetic Spectrum?



Electromagnetic Spectrum (Simplified) Concept 1

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the electromagnetic spectrum is a continuum of electromagnetic radiation containing all wavelengths and frequencies. Now, electromagnetic radiation is just the flow of light energy at the speed of light through space as either electric or metallic fields. We're going to say, the physicists of maX Plank and Albert Einstein theorized that this radiation was made up of packets or particles. Now this light particle or pack it was referred to as a photon. Okay. And a collection of them as a quantum. Now, as we move from radio waves to gamma rays within an electromagnetic spectrum, we're going to see that the wavelength is going to decrease and our frequency will increase. So if we take a look here, this represents our electromagnetic spectrum. So on the far left here we have long radio waves associated with them is a frequency of 10-0, which is one hurts. And if you look, our wave length in m is 10 to the eight m. Pretty long. What we're gonna do here is we're moving from left to right. So from light long radio waves, we go to radio waves which can be separated into AM and FM and realize that this makes sense because if you look on your radio realize that the AM stations, they have smaller numbers. The FM stations have larger numbers because their frequencies are higher. As we're moving from left to right, the frequency is increasing after radio waves. We have microwaves, then infrared. This colorful portion that we see in color that represents the visible light spectrum. This is the small part of the electromagnetic spectrum that we can see with our own eyes without the need of instruments. After that we have UV. Then we have X rays and then finally gamma rays. And if you look for gamma rays, their energy or frequency is 10 to the 24. Pretty big number. Remember energy and frequency are directly related. This. High frequency correlates to high energy. Look at the weight. Look at the wavelength, the wavelength is incredibly small. 10 to the negative. 16. And here we can see that through this depiction of the wave. Look at how the waves started off very spaced out between the waves. That's because wavelength was very large. But as we move more and more to the right, the wave gets tighter and tighter and tighter. The wavelengths are decreasing, which means frequency is increasing. But Rachel's, there's so much to remember here. How do I remember the order of all of these different forms of electromagnetic radiation? Well, that's where our memory tool comes into play. So to remember the order. Just remember that large rude Martians invented very unusual X ray guns so large for long radio weights, rude for radio waves. Martians for microwaves invented for infrared. Very remember this is the visible light spectrum, the part that we can see unusual for UV X. Ray, four x rays and then guns four gamma raids. So just remember that the electromagnetic spectrum is a continuum of all frequencies and wavelengths. It's important to remember the order and how we go from one side to the other. There's gonna be changes in my frequency and wavelength. Remember frequency and energy are directly related and they are inversely related to wavelength.


Electromagnetic Spectrum (Simplified) Example 1

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So here we're gonna use our memory tool to help us with this example. Question. It says which kind of electromagnetic radiation contains the greatest amount of energy per Adam here. Remember, as we move from left to right, we're going to say that our frequency increases so mu is increasing and this is important to know because remember, energy and frequency are directly related, so the greatest amount of energy would correlate to the highest frequency. So who's most to the right here if we look, microwave is for Martians. So that's out X rays over here. And the only thing higher than that is gamma rays. And we don't have gamma rays listed as an option. So here are answer would have to be choice. Be Remember. Large, rude Martians invented very unusual X ray guns stands for long radio waves, Radio waves. Here we have microwaves. Here we have infrared, the visible light spectrum. We have UV light X ray and then gamma ray


Electromagnetic Spectrum (Simplified) Concept 2

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so the visible light spectrum represents a small portion of the continuum, the electromagnetic spectrum itself that can be seen without the aid of instruments by us And here. We're going to say that in order to remember the colors involved with the visible light spectrum. Just remember Roy G. Biv Here are is red. Then we have orange yellow we have here green, blue, indigo and violet now realize that sometimes in more modern, visible light spectrums, they'll combine indigo and violet together and just say it's violet. And when we're talking about the visible light spectrum, realized that it ranges from 700 nanometers for red light all the way to around 380 nanometers for violent light. And remember, in terms of the electromagnetic spectrum, we're going to say that red is near infrared and in the violet end is next to ultra violet. No, that's blue, but you get what I mean. So that's a good way of remembering what other electromagnetic radiations are near the visible light spectrum. Red is next to the infrared, and then violent is next to ultraviolet. So just remember, the visible light spectrum is important to us because that's what we can see with our bare eyes, without the use of any types of instruments,

Which of the following sources of electromagnetic radiation will have the highest energy?


A carbon–oxygen double bond within a sugar molecule absorbs electromagnetic radiation at a frequency of 6.0 x 1012 s-1. What portion of the electromagnetic spectrum does this represent?


X-Ray detectors are devices that use scintillators to convert X-rays into light in order to detect X-Rays indirectly. Which of the following would be picked up by an X-Ray detector:radiation with a wavelength of 0.85 nm or a frequency of 6.52 x 1011 s-1?