Electromagnetic Waves Lesson

These are waves created by the vibrations between an electric field and a magnetic field.

• Electromagnetic Waves

• Electromagnetic Spectrum

• Mechanical Waves

• Electromagnetic Regions

Answer explanation

Electromagnetic waves travel without the use of a medium, whereas mechanical waves require the use of one.

They travel at the speed of light.

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James Clerk Maxwell hypothesized the existence of electromagnetic waves. Who verified Maxwell's predictions by discovering radio waves?

• Michael Faraday

• Heinrich Rudolf Hertz

• Hans Christian Oersted

• Andre-Marie Ampere

Answer explanation

To credit Heinrich's contribution, electromagnetic waves are sometimes called Hertzian waves.

The unit of frequency, hertz (Hz), is also named after him.

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All electromagnetic waves travel at the speed of light. Is this statement true or false?

• True

• False

Answer explanation

All electromagnetic waves travel at the speed of light. However, the wavelength and the frequency of electromagnetic waves vary dramatically.

 

These variations make up the different regions of the electromagnetic spectrum.

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_______ are electromagnetic waves with the lowest frequency but highest wavelength.

Answer explanation

Radio waves have a frequency range of < 3x10¹¹ and its wavelength can reach up to 62 miles.

These are used in communication and mobile systems, as well as magnetic resonance imaging.

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What types of waves can travel through empty space AND mediums? (a)  

• Longitudinal

• Mechanical

• Electromagnetic

The waves mentioned above are arranged by ______ wavelengths.

Answer explanation

They are also arranged by increasing frequency.

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Electromagnetic waves allow us to see the world around us. The sea is blue and the grass is green. Which particular electromagnetic wave is responsible for this phenomenon?

• White Light

• Colours

• Visible Light

• Infrared Rays

Answer explanation

The spectrum of white light and all its colors is also called the visible spectrum.

In terms of wavelength, the color red is the longest while violet is the shortest. This is why the red we see in rainbows appears longer than other colors.

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Whenever we go to the beach on a hot summer day, we sometimes get sunburned when exposed under the sun for too long. This happens because of what particular electromagnetic wave?

• Gamma Rays

• Microwaves

• Infrared Rays

• Ultraviolet Rays

Answer explanation

This is why we don't forget to wear our sunscreen before heading out!

SPF or Sun Protector Factor in sunscreen determines the types of UV rays it will protect you from, and its efficacy in doing so.

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It is an electromagnetic wave which is commonly used in medicine to treat cancer cells.

• Gamma Rays

• Infrared Rays

• Radioactive Wave

• X-Rays

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What is the effect of electromagnetic waves on living organisms and the environment?

Answer explanation

Thank you for answering! :)

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