Among the following, which electromagnetic wave has the longest wavelength?

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Multiple Choice

Among the following, which electromagnetic wave has the longest wavelength?

Explanation:
The concept here is how wavelength varies across the electromagnetic spectrum. Wavelength gets longer as you move toward the radio end, and shorter as you move toward X-rays and gamma rays. Among the options, radio waves have wavelengths that span from millimeters to thousands of kilometers, which is far longer than infrared (which is up to about a millimeter), visible light (hundreds of nanometers), and X-rays (much shorter, nanometers to picometers). So radio waves have the longest wavelength among these choices.

The concept here is how wavelength varies across the electromagnetic spectrum. Wavelength gets longer as you move toward the radio end, and shorter as you move toward X-rays and gamma rays. Among the options, radio waves have wavelengths that span from millimeters to thousands of kilometers, which is far longer than infrared (which is up to about a millimeter), visible light (hundreds of nanometers), and X-rays (much shorter, nanometers to picometers). So radio waves have the longest wavelength among these choices.

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