6.2.1 The Electromagnetic Spectrum

• What type of wave are electromagnetic waves?

  Transverse
• Electromagnetic waves require a medium to travel through.

  False
• Infrared waves are used in night vision and thermal imaging.
• Which electromagnetic wave has the highest frequency?

  Gamma Rays
• Match the wave type with its propagation method:

  Electromagnetic Waves ↔️ Electric and magnetic fields

  Mechanical Waves ↔️ Vibration of particles
• Infrared waves are absorbed by many materials.
• Match the component of the electromagnetic spectrum with its wavelength range:

  Radio Waves ↔️ >1 m

  Microwaves ↔️ 1 mm to 1 m

  Infrared ↔️ 750 nm to 1 mm
• What is the frequency range of visible light?

  $4 \times 10^{14}$ to $7.5 \times 10^{14}$ Hz
• Which electromagnetic wave has the shortest wavelength?

  Gamma Rays
• The electromagnetic spectrum is used in medical imaging and cancer treatment.


  True
• What is the mathematical relationship between wavelength (λ) and frequency (f) of electromagnetic waves?

  $c =$$\lambda f$
• Visible light with a wavelength of 500 nm has a frequency of $6 \times 10^{14}$ Hz.
• Visible light is safe and easy to detect.


  True
• What is the key difference between electromagnetic waves and mechanical waves?

  Medium required
• Ultraviolet waves are used in tanning and sterilization.
• Mechanical waves propagate through the vibration of particles
• Order the components of the electromagnetic spectrum from longest to shortest wavelength.

  1️⃣ Radio Waves

  2️⃣ Microwaves

  3️⃣ Infrared

  4️⃣ Visible Light

  5️⃣ Ultraviolet

  6️⃣ X-rays

  7️⃣ Gamma Rays
• Microwaves are used in satellite communication and microwave ovens
• Ultraviolet waves are used for tanning and sterilization.

  True
• Match the component of the electromagnetic spectrum with its application:

  Radio Waves ↔️ TV Broadcasting

  Microwaves ↔️ Satellite Communication

  Infrared ↔️ Thermal Imaging

  Visible Light ↔️ Photography

  Ultraviolet ↔️ Tanning

  X-rays ↔️ Medical Imaging

  Gamma Rays ↔️ Cancer Treatment
• What is the mathematical relationship between wavelength (λ) and frequency (f)?

  $c =$$\lambda f$
• Visible light with a wavelength of 500 nm has a frequency of $6 \times 10^{14}$ Hz
• Gamma rays are extremely harmful and require heavy shielding
• Electromagnetic waves oscillate in both the electric and magnetic fields.
• What two properties are used to classify electromagnetic waves in the spectrum?

  Wavelength and frequency
• 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
• Mechanical waves can travel through a vacuum.

  False
• What is the wavelength range of ultraviolet waves?

  10 to 400 nm
• The electromagnetic spectrum is classified by the wavelength and frequency of the waves
• Infrared waves are absorbed by many materials
• X-rays have very high penetrating power
• The wavelength and frequency of electromagnetic waves are inversely related.
• The speed of light in a vacuum is approximately $3 \times 10^{8}$ m/s.


  True
• What are two applications of microwaves?

  Microwave ovens, satellite communication
• Electromagnetic waves are transverse waves that can travel through a vacuum.
• Match the component of the electromagnetic spectrum with its applications:

  Radio Waves ↔️ TV broadcasting

  Microwaves ↔️ Microwave ovens

  Infrared ↔️ Thermal imaging

  Visible Light ↔️ Photography
• What is the primary difference between electromagnetic and mechanical waves in terms of a medium requirement?

  Electromagnetic waves don't need a medium
• Electromagnetic waves propagate through electric and magnetic fields.

  True
• What is the typical application of radio waves?

  TV broadcasting
• What is the wavelength range of infrared waves?

  750 nm to 1 mm