6.2.1 The Electromagnetic Spectrum

• What type of waves are electromagnetic waves?

  Transverse waves
• The speed of light in a vacuum is approximately 3 \times 10^{8}</latex> m/s.
• Electromagnetic waves require a medium to travel through.

  False
• The electromagnetic spectrum is organized by frequency and wavelength.
• Which electromagnetic wave has the longest wavelength and lowest frequency?

  Radio waves
• Visible light is the only part of the electromagnetic spectrum humans can see.
• X-rays are used in medical imaging because they can see through tissues.
• Which electromagnetic wave has the shortest wavelength and highest frequency?

  Gamma rays
• Infrared waves are used in microwave ovens.

  False
• Ultraviolet waves can cause tanning and are used in medical imaging.
• What are infrared waves used for in remote controls?

  Thermal imaging
• Visible light has a lower frequency than infrared waves.

  False
• Gamma rays are produced by nuclear reactions.
• What is the formula relating the speed of light, frequency, and wavelength of electromagnetic waves?

  $c =$$f \lambda$
• Match each electromagnetic wave with its common uses:

  Radio waves ↔️ Communication

  Microwaves ↔️ Cooking

  Infrared waves ↔️ Remote controls

  X-rays ↔️ Medical imaging
• What is the electromagnetic spectrum composed of?

  Seven key components
• The electromagnetic spectrum encompasses seven key components, each with unique properties and applications
• Match the electromagnetic wave with its wavelength and common use:

  Radio waves ↔️ Longest wavelength, communication

  Microwaves ↔️ Medium wavelength, cooking
• What is the primary use of microwaves?

  Cooking
• Infrared waves are used in thermal imaging and remote controls.
• Which type of electromagnetic wave is responsible for human vision?

  Visible light
• Ultraviolet light is used in tanning beds.
• What is a common use of X-rays?

  Medical imaging
• Gamma rays have the shortest wavelength and highest frequency in the electromagnetic spectrum.
• Match the term with its definition:

  Wavelength ↔️ Distance between wave peaks

  Frequency ↔️ Number of waves per second

  Speed of light ↔️ $c$
• What is the relationship between wavelength, frequency, and the speed of light?

  $c =$$f \lambda$
• The energy of an electromagnetic wave increases with its frequency.
• What is the primary use of radio waves?

  Broadcasting
• Microwaves have medium wavelength, medium frequency, and medium energy.
• What three properties determine the unique characteristics of each type of electromagnetic wave?

  Wavelength, frequency, energy
• Radio waves have the longest wavelength and the lowest frequency
• Microwaves are used in cooking and satellite communication.
• What are infrared waves used for?

  Thermal imaging, remote controls
• Visible light has a very short wavelength and very high frequency
• What is one common use of ultraviolet waves?

  Sterilization, tanning
• X-rays have extremely short wavelengths and are used in medical imaging.
• Order the electromagnetic waves from longest to shortest wavelength.

  1️⃣ Radio waves

  2️⃣ Microwaves

  3️⃣ Infrared

  4️⃣ Visible light

  5️⃣ Ultraviolet

  6️⃣ X-rays

  7️⃣ Gamma rays
• Gamma rays have the shortest wavelength and the highest frequency
• What is the relationship between wavelength, frequency, and speed of light?

  $c =$$f \lambda$
• Radio waves are used in broadcasting and radar.