6.2.1 The Electromagnetic Spectrum

• What are electromagnetic waves?

  Waves that travel through a vacuum
• Electromagnetic waves travel at the speed of light
• Electromagnetic waves can travel through a vacuum.


  True
• Electromagnetic waves are transverse waves.


  True
• What is the approximate speed of light in a vacuum?

  3 x 10^8 m/s
• What is the order of electromagnetic waves in the spectrum from lowest to highest frequency?

  Radio, Micro, Infrared, Visible, UV, X-rays, Gamma
• Gamma rays have the highest energy in the electromagnetic spectrum.


  True
• What is the wavelength range of X-rays?

  0.01 nm to 10 nm
• Electromagnetic waves are longitudinal waves.

  False
• What is the speed of electromagnetic waves in a vacuum?

  3 x 10^8 m/s
• Match the type of electromagnetic wave with its wavelength range:

  Radio Waves ↔️ 1 mm - 100 km

  Microwaves ↔️ 1 mm - 1 m

  Infrared ↔️ 700 nm - 1 mm
• Electromagnetic waves are transverse waves.


  True
• The electromagnetic spectrum includes waves such as radio waves, microwaves, and gamma rays
• Infrared waves have a medium energy level.


  True
• Match the type of wave with its primary use:

  X-rays ↔️ Medical imaging

  Gamma Rays ↔️ Cancer treatment

  Radio Waves ↔️ Broadcasting

  Microwaves ↔️ Cooking
• As the wavelength of electromagnetic waves decreases, their frequency and energy increase
• Electromagnetic waves are transverse waves that oscillate in both the electric and magnetic fields
• Order the key properties of electromagnetic waves:

  1️⃣ Wave Type: Transverse

  2️⃣ Oscillation: Electric and Magnetic Fields

  3️⃣ Speed: 3 x 10^8 m/s

  4️⃣ Medium: Can travel through a vacuum
• Gamma rays are used in cancer treatment.


  True
• Match the wave type with its primary use:

  Radio Waves ↔️ Broadcasting, communication

  Microwaves ↔️ Cooking, radar

  Infrared ↔️ Thermal imaging, heating

  Visible Light ↔️ Seeing

  Ultraviolet ↔️ Sterilization, tanning

  X-rays ↔️ Medical imaging, security screening

  Gamma Rays ↔️ Cancer treatment, sterilization
• As you move from radio waves to gamma rays, wavelength increases.

  False
• Each region of the electromagnetic spectrum has unique applications based on its distinct properties and uses
• Microwaves are used in radar, satellite communication, and cooking
• Electromagnetic waves are produced by the acceleration
• Electromagnetic waves travel at the speed of light.


  True
• As wavelength increases, frequency decreases.

  True
• What two fundamental properties of electromagnetic waves are interconnected?

  Energy and frequency
• The wavelength of an electromagnetic wave is directly proportional to its frequency.

  False
• As wavelength decreases, both frequency and energy increase
• Electromagnetic waves are transverse waves that oscillate in both electric and magnetic fields.


  True
• Electromagnetic waves can travel through a vacuum
• Mechanical waves require a medium to propagate, whereas electromagnetic waves do not.


  True
• As the wavelength decreases, the frequency and energy of electromagnetic waves increase
• Different regions of the electromagnetic spectrum are used for a variety of applications due to their unique properties.


  True
• As the wavelength of electromagnetic waves decreases, their frequency and energy increase.


  True
• The different regions of the electromagnetic spectrum are used for applications ranging from communication to medical imaging
• Visible light has a wavelength between 400 nm and 700 nm
• Electromagnetic waves are transverse waves that travel at the speed of light.


  True
• As wavelength decreases, frequency and energy increase
• Shorter wavelengths like X-rays are more easily absorbed by matter.


  True