The electromagnetic spectrum reveals how all types of light—from radio...
Physics63 views·Updated Jun 14, 2026·2 pagesElectromagnetic Spectrum Practice Exercises
1
of 2
Understanding the Electromagnetic Spectrum
Ever wonder why ultraviolet light can give you a sunburn but visible light doesn't? The electromagnetic (EM) spectrum organizes all types of light waves based on their properties. All electromagnetic waves travel at the same speed in a vacuum , but they have different frequencies and wavelengths.
Different frequencies correspond to different colors and types of electromagnetic radiation. For example, a wave with a frequency of 5.10 × 10¹⁴ Hz appears yellow to our eyes. Waves with frequencies too low (like radio waves) or too high (like ultraviolet) can't be seen by humans, but they're still part of the same family of waves.
The different portions of the spectrum include radio waves (longest wavelength), microwaves, infrared, visible light, ultraviolet, X-rays, and gamma rays (shortest wavelength). Each type has unique applications and properties. For instance, FM radio broadcasts use waves with frequencies around 9.15 × 10⁷ Hz, which corresponds to a wavelength of about 3.28 meters.
Energy Connection: The higher the frequency of an electromagnetic wave, the more energy it carries. This explains why ultraviolet light can damage your skin while visible light doesn't!
2
of 2
Wave Properties and Calculations
Radio waves are created by vibrating electric and magnetic fields, making them both electromagnetic and transverse waves. Unlike sound waves, which need a medium to travel through, electromagnetic waves can move through empty space.
The different colors we see in visible light have different frequencies and wavelengths. Green light has a shorter period (time for one complete wave) than red light, which means green light oscillates faster. Orange light with a frequency of 5.0 × 10¹⁴ Hz has a wavelength of 6.0 × 10⁻⁷ meters (600 nanometers).
Light moves incredibly fast! When you take a photo with your phone's flash, the light travels across a room (6 meters) in just 2 × 10⁻⁸ seconds—that's 0.00000002 seconds! The electromagnetic spectrum also tells us about energy levels: X-rays pack much more energy than microwaves, which is why X-rays can penetrate your body while microwaves just heat your food.
Quick Tip: Remember the relationship between wavelength (λ), frequency (f), and speed (v): v = fλ. Since the speed of all EM waves in vacuum is constant, as frequency increases, wavelength must decrease.
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Physics63 views·Updated Jun 14, 2026·2 pagesElectromagnetic Spectrum Practice Exercises
The electromagnetic spectrum reveals how all types of light—from radio waves to gamma rays—are related. This guided tour explores how these waves differ in wavelength and frequency, while sharing key properties like speed in a vacuum.
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Understanding the Electromagnetic Spectrum
Ever wonder why ultraviolet light can give you a sunburn but visible light doesn't? The electromagnetic (EM) spectrum organizes all types of light waves based on their properties. All electromagnetic waves travel at the same speed in a vacuum , but they have different frequencies and wavelengths.
Different frequencies correspond to different colors and types of electromagnetic radiation. For example, a wave with a frequency of 5.10 × 10¹⁴ Hz appears yellow to our eyes. Waves with frequencies too low (like radio waves) or too high (like ultraviolet) can't be seen by humans, but they're still part of the same family of waves.
The different portions of the spectrum include radio waves (longest wavelength), microwaves, infrared, visible light, ultraviolet, X-rays, and gamma rays (shortest wavelength). Each type has unique applications and properties. For instance, FM radio broadcasts use waves with frequencies around 9.15 × 10⁷ Hz, which corresponds to a wavelength of about 3.28 meters.
Energy Connection: The higher the frequency of an electromagnetic wave, the more energy it carries. This explains why ultraviolet light can damage your skin while visible light doesn't!
2
of 2Sign up to see the content. It's free!
- Access to all documents
- Improve your grades
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Wave Properties and Calculations
Radio waves are created by vibrating electric and magnetic fields, making them both electromagnetic and transverse waves. Unlike sound waves, which need a medium to travel through, electromagnetic waves can move through empty space.
The different colors we see in visible light have different frequencies and wavelengths. Green light has a shorter period (time for one complete wave) than red light, which means green light oscillates faster. Orange light with a frequency of 5.0 × 10¹⁴ Hz has a wavelength of 6.0 × 10⁻⁷ meters (600 nanometers).
Light moves incredibly fast! When you take a photo with your phone's flash, the light travels across a room (6 meters) in just 2 × 10⁻⁸ seconds—that's 0.00000002 seconds! The electromagnetic spectrum also tells us about energy levels: X-rays pack much more energy than microwaves, which is why X-rays can penetrate your body while microwaves just heat your food.
Quick Tip: Remember the relationship between wavelength (λ), frequency (f), and speed (v): v = fλ. Since the speed of all EM waves in vacuum is constant, as frequency increases, wavelength must decrease.
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You can download the app in the Google Play Store and in the Apple App Store.
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