2.2.1 Nature of Light

• Light is a form of electromagnetic radiation.
• Light waves have properties such as wavelength, frequency, and speed.
• Light travels through space without needing a medium.
• Photons have energy proportional to their frequency.
• The photoelectric effect is evidence of the particle nature of light

  True
• Match the property with its description in the wave or particle nature of light:

  Wave Nature ↔️ Travels as a wavelength

  Particle Nature ↔️ Travels as discrete photons
• Light behaves as both a wave and a particle
• The frequency of light is the number of wave cycles per second
• Photons have energy proportional to their frequency
• The wave nature of light explains interference and diffraction
• What is the approximate speed of light in meters per second?

  3 x 10^8 m/s
• Light requires a medium to travel through space.

  False
• Light exhibits wave characteristics in phenomena like interference and diffraction.

  True
• Match the property with its corresponding nature of light:

  Propagation as a wavelength ↔️ Wave nature

  Propagation as discrete photons ↔️ Particle nature
• Light behaves as both waves and particles simultaneously.

  True
• Match the type of electromagnetic radiation with its wavelength range:

  Visible Light ↔️ 400 nm to 700 nm

  Radio Waves ↔️ > 1 mm

  Ultraviolet ↔️ 10 nm to 400 nm
• The speed of light in a vacuum is approximately 3 x 10^8 meters per second
• Visible light has a wavelength range of 400 nm to 700 nm.
• Wavelength is the distance between two consecutive peaks or troughs of a wave.
• The wavelength and frequency of light are inversely related.
• What is the relationship between wavelength and frequency?

  λ = v/f
• What is light transmission?

  Light passes through an object
• The angle of incidence is equal to the angle of reflection in reflection.


  True
• Photons are discrete packets of energy.
• In absorption, electrons absorb photons and transition to higher energy states.
• What is light classified as in physics?

  Electromagnetic radiation
• Match the property of light with its description:

  Wave nature ↔️ Propagation described by wavelength

  Particle nature ↔️ Composed of discrete photons

  Dual nature ↔️ Behaves as both wave and particle
• Arrange the following concepts in a logical sequence related to light:

  1️⃣ Light absorption

  2️⃣ Light transmission

  3️⃣ Reflection of light

  4️⃣ Refraction of light
• Match the property of light with its description:

  Form ↔️ Electromagnetic radiation

  Behavior ↔️ Wave and particle

  Medium Required ↔️ None

  Part of ↔️ Electromagnetic spectrum
• Arrange the following properties of light in terms of its dual nature:

  1️⃣ Light travels as a wavelength

  2️⃣ Light is composed of discrete photons

  3️⃣ Photons have energy proportional to frequency
• What does the wave nature of light explain?

  Interference and diffraction
• Light travels at a constant speed of light in both its wave and particle nature.

  True
• Light is part of the electromagnetic spectrum.


  True
• The speed of light is constant in all media.


  True
• Compton scattering is evidence of the particle nature of light.

  True
• Visible light has wavelengths between 400 nm and 700 nm.

  True
• Light travels through space without needing a medium
• The distance between consecutive wave peaks of light is called its wavelength
• Light is composed of discrete packets of energy called photons
• What is the particle nature of light observed in?

  Photoelectric effect