5.3 The Electromagnetic Spectrum

• What does the electromagnetic spectrum refer to?

  Electromagnetic radiation
• The visible region of the electromagnetic spectrum has a wavelength range from 400 to 700 nm.
• Gamma rays have a wavelength less than 0.01 nm.
• Longer wavelengths correspond to lower frequencies.


  True
• The energy of an electromagnetic wave is given by the equation \( E = hf = \frac{hc}{\lambda} \), where \( h \) is Planck's
• What is the approximate speed of light in a vacuum?

  $3 \times 10^{8}$ m/s
• Regions of the electromagnetic spectrum in increasing frequency order

  1️⃣ Radio ||| Microwave ||| Infrared ||| Visible ||| Ultraviolet ||| X-ray ||| Gamma ray
• All electromagnetic waves travel at the same speed in a vacuum.


  True
• Energy is the wave's ability to do work and is measured in Joules.


  True
• The energy of an electromagnetic wave is directly proportional to its frequency.
• What equation relates frequency, wavelength, and speed?

  v = fλ
• Match the region of the electromagnetic spectrum with its wavelength range:

  Radio ↔️ > 1 mm

  Visible ↔️ 400 - 700 nm

  Gamma Ray ↔️ < 0.01 nm
• The four main properties of electromagnetic waves are wavelength, frequency, speed, and energy.


  True
• Planck's constant is approximately 6.626 x 10^-34 Js.
• What is frequency measured in?

  Hertz
• In a vacuum, all electromagnetic waves travel at the same speed.


  True
• Match the type of electromagnetic wave with its characteristics:

  Radio Waves ↔️ Low energy, broadcasting

  Microwaves ↔️ Thermal effects, cooking

  Infrared Waves ↔️ Thermal imaging, heating

  Visible Light ↔️ Human vision, photography

  Ultraviolet Waves ↔️ Sterilization, skin cancer risk
• The radio wave region has a wavelength range greater than 1 mm.
• Radio waves have a higher frequency than microwaves.

  False
• Regions of the electromagnetic spectrum differ in their wavelength and frequency characteristics.


  True
• What are the four key properties of electromagnetic waves?

  Wavelength, frequency, speed, energy
• What is the speed of light in a vacuum?

  $3 \times 10^{8}$ m/s
• What is the value of Planck's constant in SI units?

  6.626 \times 10^{-34}</latex> Js
• Match each region of the electromagnetic spectrum with its wavelength range:

  Radio ↔️ > 1 mm

  Microwave ↔️ 1 mm - 1 m

  Infrared ↔️ 700 nm - 1 mm

  Visible ↔️ 400 - 700 nm
• What are the four fundamental properties of electromagnetic waves?

  Wavelength, frequency, speed, energy
• Match each wave property with its definition:

  Frequency ↔️ Cycles per second

  Wavelength ↔️ Distance between crests

  Energy ↔️ Wave's ability to do work
• What is the relationship between wavelength and frequency?

  v = fλ
• What is the value of Planck's constant?

  6.626 x 10^-34 Js
• The energy of an electromagnetic wave can be calculated using Planck's equation.


  True
• How many types of electromagnetic waves are there in the electromagnetic spectrum?

  Seven
• Match the wave property with its symbol and unit:

  Frequency ↔️ f (Hz)

  Wavelength ↔️ λ (m)

  Energy ↔️ E (J)
• What is the wavelength range of microwaves?

  1 mm - 1 m
• What is the frequency range of X-rays?

  30 EHz - 30 PHz
• Match the region of the electromagnetic spectrum with its wavelength range:

  Microwave ↔️ 1 mm - 1 m

  Ultraviolet ↔️ 10 - 400 nm

  Gamma ray ↔️ < 0.01 nm

  Infrared ↔️ 700 nm - 1 mm
• Frequency is the number of waves that pass a point per second.
• Match the property of electromagnetic waves with its definition:

  Wavelength ↔️ Distance between crests/troughs

  Frequency ↔️ Waves per second

  Energy ↔️ Wave's ability to do work
• Frequency is measured in Hertz (Hz).


  True
• The energy of a wave is its ability to do work
• Regions of the electromagnetic spectrum are characterized by their unique wavelength and frequency ranges.


  True
• The relationship between wavelength and frequency is given by v = f$\lambda$.