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Rainbows and Radios: The Electromagnetic Spectrum
Have you ever noticed the beautiful colors in a rainbow? Just like a rainbow has different colors, the electromagnetic spectrum includes different types of light - some we can see, and some we can't. The spectrum starts with radio waves used for TV and radio broadcasts, then comes microwaves used for heating food. The part we are most familiar with is the visible light, which helps us see. Beyond that, we have ultraviolet light that can give us sunburns, x-rays that doctors use to look inside our bodies, and gamma rays, which are used in treating cancer. Amazingly, all these waves, even though their energies differ, travel at the same speed - the speed of light!
Question 1
What type of electromagnetic waves are used for heating food?
Radio waves
Microwaves
Explanation. Microwaves are used for heating food as they cause water molecules in the food to vibrate, which produces heat.
Visible light
Ultraviolet light
Gamma rays
Question 2
Which type of electromagnetic waves can give us sunburns?
Visible light
Radio waves
Microwaves
Ultraviolet light
Explanation. Ultraviolet light can give us sunburns because it has enough energy to damage skin cells.
Gamma rays
Question 3
What is the speed of all the waves in the electromagnetic spectrum?
Different speeds
Speed of sound
Speed of light
Explanation. All the waves in the electromagnetic spectrum, regardless of their energy, travel at the same speed - the speed of light.
Half the speed of light
Twice the speed of light
Question 4
Which type of electromagnetic waves are used in television broadcasts?
Gamma rays
Ultraviolet light
Visible light
Microwaves
Radio waves
Explanation. Radio waves are used for TV and radio broadcasts due to their long wavelength and ability to carry data over long distances.
Question 5
What type of electromagnetic waves are used in treating cancer?
Radio waves
Ultraviolet light
Microwaves
Visible light
Gamma rays
Explanation. Gamma rays are used in treating cancer because they have a high energy that can kill cancer cells.
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