ArtsAutosBooksBusinessEducationEntertainmentFamilyFashionFoodGamesGenderHealthHolidaysHomeHubPagesPersonal FinancePetsPoliticsReligionSportsTechnologyTravel

What is the Electromagnetic Spectrum?

Updated on April 1, 2014

What are the essential points I need to know?

Did you know that electromagnetic waves are the vibrations of electric and magnetic fields? This means that they don't need anything to travel around. Visible light waves are a classic example of this, as they have travelled from the sun which is millions of miles away!

Radio waves have the longest wavelength and lowest frequency in the spectrum, whereas gamma rays have the shortest wavelength and the highest frequency in the spectrum. We can only see a small proportion of the electromagnetic spectrum, which is visible light. There are seven types of waves in the electromagnetic spectrum, each which have their own properties. In the table below, there are all the electromagnetic waves in the spectrum.

Electromagnetic Wave Summary Table

Electromagnetic Wave
Wavelength (m)
Frequency (Hz)
Radio Waves
Communication, microwave
Infrared waves
Communication, toasters, grills
Visible light waves
Communications, laser light
Ultraviolet waves
Tanning beds, detecting forged bank notes
Medical, security
Gamma rays
Medical, food industry

Radio waves

Radio waves have the longest wavelength in the electromagnetic spectrum and the lowest frequency. Radio waves can be from a few km big to a few metres. Radio waves are usually used for communications like your car stereo. The radio in your car picks up radio waves, that is why we can hear the radio station that is playing.



Microwaves are the second longest wave in the electromagnetic spectrum, but these waves are measured in centimetres. The longest and most useful length of microwave is the foot long one, as it is used in our microwaves for heating food up. Microwaves are also used for viewing the earth from space as they can penetrate most materials. They are also used in radar systems like forecasting the weather and they are also used in communications as they can penetrate almost anything.

Infrared Waves

Infrared waves are very useful to us. Not only is it the third wave in the electromagnetic spectrum, infrared waves are also used for communications and cooking. They have wavelengths in the region of 1 millimetre to about 750 nanometres. Infrared waves are in toasters and grills, which means you can cook your food with them. Infrared waves can also be used in burgular alarms, mobile phones and most commonly in remote controls. So when you switch on your TV the next time, just think that infrared waves are communicating with the sensor in the TV to switch it on!

Visible Light Waves

Visible light waves are the only part of the electromagnetic spectrum, which we can see as the colours in the rainbow. Their wavelength is roughly 380 nanometres to 740 nanometres. Our primary and source of light is the sun, but artificial light like light bulbs also can produce light waves. Light waves are used in communications such as fibre optic cables. Light waves are also very useful to plants, as they can photosynthesise with light waves to produce oxygen and glucose from carbon dioxide and water. Although, strong light to the eye can cause blindness.


Ultraviolet Waves

Ultraviolet waves are used in many places in our every day lives. For example, if you pop down to the bank they will scan over your bank note with a UV light to make sure it isn't forged. Also many people use UV waves to tan themselves, whether they use a tanning bed or tan naturally in the sun it doesn't matter. However, too much UV rays can burn your skin and increase your chance of getting cancer. Furthermore, UV light is used in the dentist industry in many diiferent ways like hardening brace glue to teeth. Ultraviolet waves have wavelengths between 10 and 380 nanometres.


X-rays are most often used in the medical industry, but can also be used in the security industry as well. Their wavelengths are between 10 and 0.01 nanometres. Their use in the medical industry is really useful, as they can detect broken bones and other various medical conditions. This can then be used to treat your medical condition better. Moreover, in the security industry they can be used to detect items inside of people trying to smuggle things into or out of the country.

Gamma Rays

Gamma rays have the shortest wavelength in the electromagnetic spectrum and the highest frequency. Their wavelength is less than 10 picometres. Gamma rays are starting to be used in medicine as they can penetrate the body with ease. This could lead to new cancer treatment and hopefully saving more lives. Also gamma rays are used in the food industry to seal cans and make sure the environment in the can is sterile so the food doesn't go off. The dosage is only very small so it will not affect you in anyway.

Electromagnetic Spectrum Rap

What wave do you like the most?

See results

How can I remember all the waves in the electromagnetic spectrum?

There is a very unique acronym I was taught which goes as follows; randy men in leather underwear excite gays. Now in practice this looks like this:

  • Radio Waves
  • Microwaves
  • Infrared Waves
  • Visible Light Waves
  • Ultraviolet Waves
  • X-rays
  • Gamma Rays

If you can come up with any of your own, comment it in the comments box and I will add it to the list if you would like it to be on the list.

Other science articles you may like:

What are Alkanes?

What are Alkenes?


    0 of 8192 characters used
    Post Comment

    • sehrm profile image


      4 years ago from Los Angeles

      Good summary of the electromagnetic spectrum! Thanks.


    This website uses cookies

    As a user in the EEA, your approval is needed on a few things. To provide a better website experience, uses cookies (and other similar technologies) and may collect, process, and share personal data. Please choose which areas of our service you consent to our doing so.

    For more information on managing or withdrawing consents and how we handle data, visit our Privacy Policy at:

    Show Details
    HubPages Device IDThis is used to identify particular browsers or devices when the access the service, and is used for security reasons.
    LoginThis is necessary to sign in to the HubPages Service.
    Google RecaptchaThis is used to prevent bots and spam. (Privacy Policy)
    AkismetThis is used to detect comment spam. (Privacy Policy)
    HubPages Google AnalyticsThis is used to provide data on traffic to our website, all personally identifyable data is anonymized. (Privacy Policy)
    HubPages Traffic PixelThis is used to collect data on traffic to articles and other pages on our site. Unless you are signed in to a HubPages account, all personally identifiable information is anonymized.
    Amazon Web ServicesThis is a cloud services platform that we used to host our service. (Privacy Policy)
    CloudflareThis is a cloud CDN service that we use to efficiently deliver files required for our service to operate such as javascript, cascading style sheets, images, and videos. (Privacy Policy)
    Google Hosted LibrariesJavascript software libraries such as jQuery are loaded at endpoints on the or domains, for performance and efficiency reasons. (Privacy Policy)
    Google Custom SearchThis is feature allows you to search the site. (Privacy Policy)
    Google MapsSome articles have Google Maps embedded in them. (Privacy Policy)
    Google ChartsThis is used to display charts and graphs on articles and the author center. (Privacy Policy)
    Google AdSense Host APIThis service allows you to sign up for or associate a Google AdSense account with HubPages, so that you can earn money from ads on your articles. No data is shared unless you engage with this feature. (Privacy Policy)
    Google YouTubeSome articles have YouTube videos embedded in them. (Privacy Policy)
    VimeoSome articles have Vimeo videos embedded in them. (Privacy Policy)
    PaypalThis is used for a registered author who enrolls in the HubPages Earnings program and requests to be paid via PayPal. No data is shared with Paypal unless you engage with this feature. (Privacy Policy)
    Facebook LoginYou can use this to streamline signing up for, or signing in to your Hubpages account. No data is shared with Facebook unless you engage with this feature. (Privacy Policy)
    MavenThis supports the Maven widget and search functionality. (Privacy Policy)
    Google AdSenseThis is an ad network. (Privacy Policy)
    Google DoubleClickGoogle provides ad serving technology and runs an ad network. (Privacy Policy)
    Index ExchangeThis is an ad network. (Privacy Policy)
    SovrnThis is an ad network. (Privacy Policy)
    Facebook AdsThis is an ad network. (Privacy Policy)
    Amazon Unified Ad MarketplaceThis is an ad network. (Privacy Policy)
    AppNexusThis is an ad network. (Privacy Policy)
    OpenxThis is an ad network. (Privacy Policy)
    Rubicon ProjectThis is an ad network. (Privacy Policy)
    TripleLiftThis is an ad network. (Privacy Policy)
    Say MediaWe partner with Say Media to deliver ad campaigns on our sites. (Privacy Policy)
    Remarketing PixelsWe may use remarketing pixels from advertising networks such as Google AdWords, Bing Ads, and Facebook in order to advertise the HubPages Service to people that have visited our sites.
    Conversion Tracking PixelsWe may use conversion tracking pixels from advertising networks such as Google AdWords, Bing Ads, and Facebook in order to identify when an advertisement has successfully resulted in the desired action, such as signing up for the HubPages Service or publishing an article on the HubPages Service.
    Author Google AnalyticsThis is used to provide traffic data and reports to the authors of articles on the HubPages Service. (Privacy Policy)
    ComscoreComScore is a media measurement and analytics company providing marketing data and analytics to enterprises, media and advertising agencies, and publishers. Non-consent will result in ComScore only processing obfuscated personal data. (Privacy Policy)
    Amazon Tracking PixelSome articles display amazon products as part of the Amazon Affiliate program, this pixel provides traffic statistics for those products (Privacy Policy)