Electro Magnetic Spectrum and Light

Electro Magnetic Spectrum is every possible frequency available of electromagnetic radiation. When an object is electro magnetic spectrum, it means that the object has absorbed or has a characteristic of electro magnetic radiation. When measuring the frequency of electromagnetic spectrum, it depends on the length of the wave. Shorter the wavelength, the higher the frequency is going to be. Some of the properties involved with electro magnetic spectrum is frequency and wavelength. Electro magnetic spectrum can be used for radios, as the radios wave contain electromagnetic radiation.

All parts of the Spectrum

Electro magnetic spectrum have many parts to it. These parts include microwaves, infrared light, ultraviolet light, x-rays and gamma rays. Down below explain each part in further detail.


Microwaves are a type of electro magnetic wave. These waves are generally 1 metre to centimetres therefore making the wavelength short. Microwave can make various molecules hot and heat up. An example of this is popcorn (molecules) heating up in a microwave (with microwaves traveling). Radar also uses microwaves to track echoes by the microwaves passing the object and reflecting back to give the signal.

Infrared light

Infrared light contains electromagnetic radiation and generally has a wavelength longer than light that is visible to us. Infrared light can be used from measuring the temperature of something, night vision and tracking something with heat.

An example of infrared light.

Ultraviolet light

Ultraviolet light contains electromagnetic radiation and has a shorter wavelength than visible light. The human eye can not visibly see ultraviolet light. Although we can not see them, they can harm us as they contain cancer risks to our body. The sun can be responsible for ultraviolet light as it can produce it.


X-rays (X-radiation) contains electromagnetic radiation. Certain x-rays can travel through some solids depending on the wave. X-rays have longer wavelengths then gamma waves and thats what make them different. X-rays can be used to to see through solids. For example, x ray is used to see a human bone.

Gamma Rays

Gamma rays contain electromagnetic radiation and generally have a short wavelength therefore meaning it has a high frequency. Like ultraviolet light, gamma rays can cause health issues to the human body. Gamma rays can be used to some time kill types of cancer (although they can cause cancer) and like x-ray see through solids.

EM Trends

Electro magnetic trends are the wavelengths of waves which determine colours. The longest wave is generally a red like colour while the shortest wave is a violet like colour. Here is a table showing the colours in order.


Wavelength, energy, frequency and trends

Electromagnetic spectrum has many properties to it and these properties include wavelength, energy, frequency and trends. Listed below expalins and details the properties below.


Wavelength is the length the wave travels. In this case, electromagnetic spectrum uses wavelength to measure the electromagnetic radiation waves. The shorter the wave. the higher the frequency.


Energy is generally what causes the wave to be produced. In this case, electromagnetic spectrum uses energy because energy produces the electro magnetic radiation waves. Photon energy usually produces electromagnetic radiation waves.


Frequency is the amount of times a wave occurs. In this case, electromagnetic spectrum uses frequency to discover how many times an electromagnetic radiation waves has a occurred in a period of time.


Trends relating to electromagnetic radiation, is the visible lights that produce different colours. The shorter the light wave, the more likely the colour is going to be a violet like colour while a red like colour will appear if the wave is long.

Light (speed of light)

Light is a type of electro magnetic radiation light. Light is visible to the human eye and is the reason why the eye can see images. Although light is a type of electro magnetic radiation, it can cause as much harm as other radiation waves or light such as gamma rays and ultraviolet waves. The speed of light is much faster than sound and is currently 299 792 458m/s in an empty space with no matter or atmosphere (vacuum).

An example of light.

Visible light (colours)

Visible light is the only type of electromagnetic wave that is visible to the human eye. Visible light produce different colours depending on their wavelength. An example of this is a red colour will appear if the light wave is long and a violet wave will appear if the wave is short. This is the order (shortest wave to longest wave), violet, purple, aqua, blue, dark green, light green, yellow, orange and then red. When all the waves are together, the colour white appears. Without light, colours wouldnt be able to be produced.

Why is the sky blue?

Visible light and the EM trend is the reason why the sky is blue. Our atmosphere produces short waves in the sky. These waves are the same size as a wave would be if it produced the colour blue.