6.2.1 The Electromagnetic Spectrum

• Electromagnetic waves are created by the oscillation of electric and magnetic fields.
• Order the regions of the electromagnetic spectrum from lowest to highest frequency:

  1️⃣ Radio waves

  2️⃣ Microwaves

  3️⃣ Infrared

  4️⃣ Visible light

  5️⃣ Ultraviolet

  6️⃣ X-rays

  7️⃣ Gamma rays
• The speed of light in a vacuum is approximately 3 x 10^8 m/s.

  True
• Higher frequencies in the electromagnetic spectrum correspond to shorter wavelengths and higher energy levels.


  True
• Electromagnetic waves are classified as transverse waves.
• What is the approximate value of the speed of light in a vacuum?

  3 \times 10^8 \, \text{m/s}</latex>
• Match the region of the electromagnetic spectrum with its frequency range:

  Radio waves ↔️ $3 \, \text{kHz} - 300 \, \text{GHz}$

  Infrared ↔️ $300 \, \text{GHz} - 430 \, \text{THz}$

  Ultraviolet ↔️ $750 \, \text{THz} - 30 \, \text{PHz}$

  Gamma rays ↔️ $> 30 \, \text{EHz}$
• Gamma rays have the shortest wavelength in the electromagnetic spectrum.


  True
• Match the region of the electromagnetic spectrum with its common uses:

  Radio waves ↔️ Broadcasting, communication

  Microwaves ↔️ Satellite communication, ovens

  Infrared ↔️ Thermal imaging, remote controls

  Visible light ↔️ Human vision, photography

  Ultraviolet ↔️ Sterilization, tanning

  X-rays ↔️ Medical imaging

  Gamma rays ↔️ Cancer treatment, sterilization
• What is the formula that relates wavelength, frequency, and the speed of light for electromagnetic waves?

  $c =$$\lambda f$
• What is the relationship between wavelength and frequency in electromagnetic waves?

  Inversely proportional
• What are electromagnetic waves created by?

  Oscillation of electric and magnetic fields
• Order the components of the electromagnetic spectrum from lowest to highest frequency.

  1️⃣ Radio waves

  2️⃣ Microwaves

  3️⃣ Infrared

  4️⃣ Visible light

  5️⃣ Ultraviolet

  6️⃣ X-rays

  7️⃣ Gamma rays
• As wavelength increases, frequency decreases in electromagnetic waves.

  True
• Which region of the electromagnetic spectrum has the lowest energy level?

  Radio waves
• Which region of the electromagnetic spectrum is used for cancer treatment?

  Gamma rays
• The electromagnetic spectrum is ordered by frequency and wavelength.

  True
• The wavelength and frequency of an electromagnetic wave are inversely related.
• As the wavelength of an electromagnetic wave increases, its frequency decreases.
• Gamma rays have the highest energy level and the shortest wavelength.
• What orders the electromagnetic spectrum?

  Frequency and wavelength
• The wavelength ($λ$) and frequency ($f$) of an electromagnetic wave are related by the equation $c =$$λf$, where $c$ is the speed of light.
• What can be calculated if the wavelength of an electromagnetic wave is known?

  Frequency
• X-rays are used in medical imaging.
• The applications of the electromagnetic spectrum depend on the unique properties and energy levels of each region.


  True
• What is one common use of radio waves?

  Broadcasting
• Match the region of the electromagnetic spectrum with its common use:

  Radio waves ↔️ Broadcasting

  Microwaves ↔️ Satellite communication

  Ultraviolet ↔️ Sterilization

  X-rays ↔️ Medical imaging