EM Spectrum Lesson

Electromagnetic energy travels through space in waves. The electromagnetic spectrum includes all electromagnetic waves, arranged according to frequency and wavelength. Which of these is an example of an electromagnetic wave?

• radio wave

• sound wave

• ocean wave

• gravitational pull

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The visible part of the electromagnetic spectrum consists of the colors that we see in a rainbow. Different colors correspond to different wavelengths of light. Which color of visible light has the shortest wavelength?

• red

• green

• violet

• yellow

Electromagnetic radiation is energy that travels in waves. Two types of electromagnetic waves are infrared waves and ultraviolet waves. Which of these statements describes a property that is shared by infrared waves and ultraviolet waves?

• Both waves have the same energy.

• Both waves have the same frequency.

• Both waves have the same wavelength.

• Both waves travel at the same speed in a vacuum.

Imagine a scientist detects an electromagnetic wave with a higher frequency than that of most gamma-ray waves. The scientist calls these waves delta rays. Which of these statements would be true of delta rays?

• Delta rays would travel faster than most gamma rays.

• Delta rays would have more energy than most gamma rays do

• Delta rays would have the same wavelength as most gamma rays.

• Delta rays would have a longer wavelength than most gamma rays have.

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Cell phones (also have microwaves) and televisions use this type of EM wave. It has the longest wavelength with the lowest frequency.

• Radio Wave

• TV Wave

• Gamma wave

• Ultraviolet Wave

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Which portion of the electromagnetic spectrum includes the range of light that can be detected by the human eye?

• ultraviolet light

• visible light

• infrared light

• x-rays

If the wavelength of an electromagnetic wave is increasing, what is true about the energy?

• Energy is increasing

• Energy is decreasing

• Energy is not dependent on wavelength.

• energy is cancelled out

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Which part of the electromagnetic spectrum has high enough energy to cause sunburn?

• infrared light

• visible light

• ultraviolet light

• microwaves

The type of wave with the shortest wavelength and highest frequency. This type of wave is extremely harmful.

• radio

• infrared

• gamma

• x ray

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The type of EM wave that is used to cook food. It has a higher frequency (and shorter wavelength) than radio waves.

• radio

• microwave

• gamma

• visible light

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