P5.2 The Electromagnetic Spectrum

• Electromagnetic waves in the spectrum differ in their frequency and wavelength.


  True
• Radio waves have a low frequency
• Order the electromagnetic waves from low to high frequency.

  1️⃣ Radio waves

  2️⃣ Microwaves

  3️⃣ Infrared

  4️⃣ Visible light

  5️⃣ Ultraviolet

  6️⃣ X-rays

  7️⃣ Gamma rays
• What are microwaves used for?

  Heating substances
• What type of electromagnetic wave can cause sunburn?

  Ultraviolet
• Match the electromagnetic wave with its primary use:

  Radio Waves ↔️ Communication

  Microwaves ↔️ Cooking

  Infrared ↔️ Thermal imaging

  Visible Light ↔️ Photography

  Ultraviolet ↔️ Sterilization
• Match the electromagnetic wave type with its key property:

  Radio waves ↔️ Penetrate obstacles

  Microwaves ↔️ Heat substances

  Infrared ↔️ Produce heat

  Visible light ↔️ Allow us to see

  Ultraviolet ↔️ Can cause sunburn
• Ultraviolet waves have extremely short wavelengths and can cause sunburn.


  True
• Gamma rays are used for industrial sterilization due to their high energy
• What is the electromagnetic spectrum?

  A range of waves
• Electromagnetic waves in the spectrum all travel at the same speed in a vacuum.


  True
• Electromagnetic waves differ in their length, which gives them distinct properties and uses.
• Radio waves have the longest wavelength in the electromagnetic spectrum.


  True
• X-rays have extremely high frequency and short wavelength.
• Order the electromagnetic spectrum from low to high frequency:

  1️⃣ Radio Waves

  2️⃣ Microwaves

  3️⃣ Infrared

  4️⃣ Visible Light

  5️⃣ Ultraviolet

  6️⃣ X-rays

  7️⃣ Gamma Rays
• As frequency increases, wavelength decreases in the electromagnetic spectrum.
• What is one property of microwaves that makes them suitable for radar and satellite communication?

  Can heat substances
• Ultraviolet waves can cause sunburn and are used for sterilization and tanning.
• Match the wave type with its use and example:

  Radio Waves ↔️ Communication, broadcasting; Radios

  Microwaves ↔️ Cooking, radar; Microwave ovens

  Infrared ↔️ Heat, thermal imaging; Night vision goggles

  Visible Light ↔️ Vision, lighting; Light bulbs

  Ultraviolet ↔️ Sterilization, tanning; UV sterilizers

  X-rays ↔️ Medical imaging, security scanning; X-ray machines

  Gamma Rays ↔️ Cancer treatment, industrial sterilization; Radiotherapy
• Radio waves are used for broadcasting and allow televisions to transmit signals over long distances.


  True
• Ultraviolet waves are used in sunbeds to provide tans.
• What is the electromagnetic spectrum defined as?

  A range of electromagnetic waves
• What type of electromagnetic wave has a medium frequency and wavelength?

  Microwaves
• As frequency increases in the electromagnetic spectrum, wavelength decreases.

  True
• Infrared waves are used in remote controls
• X-rays are used in medical imaging because they can penetrate soft tissues.


  True
• What are the two primary properties used to compare and contrast electromagnetic waves?

  Frequency and wavelength
• Infrared waves are used for thermal imaging because they produce heat
• What are X-rays commonly used for in medicine?

  Medical imaging
• Order the 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
• Gamma rays are used for radiotherapy because they are highly energetic
• What are the different types of electromagnetic waves in the electromagnetic spectrum?

  Radio to gamma rays
• What is the lowest frequency type of electromagnetic wave in the spectrum?

  Radio waves
• Which type of electromagnetic wave produces heat and is used in thermal imaging?

  Infrared
• Radio waves are used for communication, while X-rays are used for medical imaging.

  True
• Electromagnetic waves are ordered by frequency from low to high.

  True
• Match the wave type with its key property:

  Radio Waves ↔️ Penetrate obstacles

  Microwaves ↔️ Heat substances

  Infrared ↔️ Produce heat

  Visible Light ↔️ Allow us to see

  Ultraviolet ↔️ Can cause sunburn

  X-rays ↔️ Penetrate soft tissues

  Gamma Rays ↔️ Highly energetic
• Infrared waves are used for thermal imaging and remote controls.


  True
• Which type of electromagnetic wave is used for medical imaging because it can penetrate soft tissues?

  X-rays
• Gamma rays are used for cancer treatment and industrial sterilization.