1.3.2 Electromagnetic Spectrum

• What is the electromagnetic spectrum defined as?

  Range of electromagnetic radiation
• Order the following electromagnetic waves from lowest to highest frequency:

  1️⃣ Radio Waves

  2️⃣ Microwaves

  3️⃣ Infrared

  4️⃣ Visible Light

  5️⃣ Ultraviolet

  6️⃣ X-rays

  7️⃣ Gamma Rays
• Microwaves are used in satellite communication
• Gamma rays are used in cancer treatment
• What is an example use of infrared waves?

  Night vision
• What is an example use of gamma rays?

  Cancer treatment
• Microwaves have a medium frequency and medium wavelength.
• Ultraviolet waves are used for curing plastics.
• Arrange the types of electromagnetic waves from lowest frequency to highest frequency.

  1️⃣ Radio Waves

  2️⃣ Microwaves

  3️⃣ Infrared

  4️⃣ Visible Light

  5️⃣ Ultraviolet

  6️⃣ X-rays

  7️⃣ Gamma Rays
• Infrared waves are used in remote controls because they are detected as heat
• The electromagnetic spectrum is ordered from waves with the lowest frequency to the highest frequency.
• Match the wave type with its example use:

  Radio Waves ↔️ Radio/TV broadcasting

  Microwaves ↔️ Microwave ovens

  Infrared ↔️ Remote controls

  Visible Light ↔️ Photography

  Ultraviolet ↔️ Disinfection

  X-rays ↔️ Medical imaging

  Gamma Rays ↔️ Cancer treatment
• The frequency and wavelength of an electromagnetic wave determine its properties and applications.
• Order the following electromagnetic waves from shortest to longest wavelength:

  1️⃣ Gamma Rays

  2️⃣ X-rays

  3️⃣ Ultraviolet

  4️⃣ Visible Light

  5️⃣ Infrared

  6️⃣ Microwaves

  7️⃣ Radio Waves
• Each type of electromagnetic wave has a unique combination of frequency and wavelength.
• What is the frequency range of radio waves?

  Low frequency
• Which type of electromagnetic wave is detected as heat?

  Infrared
• What is the primary use of X-rays?

  Medical imaging
• Radio waves have a low frequency and long wavelength.
• Visible light is detected by the human eye.
• The relationship between frequency and wavelength in electromagnetic waves is inversely proportional
• The unit of frequency in the formula $v =$$f \lambda$ is Hertz
• Match the variable in the formula $v =$$f \lambda$ with its meaning:


  v ↔️ Wave speed

  f ↔️ Frequency

  \lambda ↔️ Wavelength
• What are three example uses of microwaves?

  Radar, satellite communication, microwave ovens
• What are three uses of ultraviolet waves?

  Disinfection, tanning, curing of plastics
• What is a key property of radio waves that makes them useful for broadcasting?

  Penetrate obstacles well
• What is a key property of visible light that allows for photography?

  Detected by the human eye
• What type of relationship exists between the frequency and wavelength of electromagnetic waves?

  Inversely proportional
• What is the wavelength of an electromagnetic wave with a frequency of 100 MHz and a wave speed of 3 x 10^8 m/s?

  3 meters
• Match the electromagnetic wave type with its characteristic:

  Radio Waves ↔️ Low frequency, long wavelength

  Microwaves ↔️ Medium frequency, medium wavelength

  Infrared ↔️ High frequency, short wavelength

  Gamma Rays ↔️ Highest frequency, shortest wavelength
• What is the unit of wave speed in the formula $v =$$f \lambda$?


  m/s
• Radio waves have a low frequency and a long wavelength
• Visible light is detected by the human eye
• Gamma rays have the highest frequency and the shortest wavelength
• Infrared waves are used in night vision because they are detected as heat.
• Arrange the electromagnetic waves in order from longest to shortest wavelength:

  1️⃣ Radio Waves

  2️⃣ Microwaves

  3️⃣ Infrared

  4️⃣ Visible Light

  5️⃣ Ultraviolet

  6️⃣ X-rays

  7️⃣ Gamma Rays
• The wave speed of electromagnetic waves in a vacuum is constant.
• Electromagnetic waves carry energy through space without transferring matter
• What is an example use of radio waves?

  Radio broadcasting
• What is an example use of ultraviolet waves?

  Disinfection