2.1.3 Wave Behavior

• What does wave behavior encompass?

  Waves interacting with media
• What determines the extent of diffraction in a wave?

  Wavelength and obstacle size
• In refraction, a wave changes direction and speed
• What is wave propagation?

  Energy transfer through a medium
• What is the frequency of a wave measured in?

  Hertz
• Which type of wave propagates faster: waves with shorter wavelengths or waves with longer wavelengths?

  Shorter wavelengths
• What happens to a wave's speed when it enters a denser medium in refraction?

  It decreases
• What are some phenomena explained by refraction?

  Lenses, prisms, mirages
• Order the changes that occur when a wave moves from a less dense to a denser medium.

  1️⃣ Speed decreases

  2️⃣ Wavelength shortens

  3️⃣ Bends towards the normal
• Waves diffract more when passing through smaller openings or around smaller obstacles.
• In constructive interference, the crests and troughs of the waves line up, causing the amplitude to increase.
• Match the wave behavior with its description.

  Reflection ↔️ Wave bounces off surface

  Refraction ↔️ Wave changes direction and speed

  Diffraction ↔️ Wave bends around edges

  Interference ↔️ Waves combine to form new pattern
• Waves propagate faster in mediums with lower density and elasticity.

  False
• How does the speed of a wave change when it moves from a less dense to a denser medium?

  Decreases
• Refraction is the bending of a wave as it moves from one medium to another with different densities
• When a wave passes from a denser medium to a less dense medium, its speed increases.

  True
• Refraction is crucial in lenses, prisms, and understanding atmospheric phenomena like mirages
• Waves diffract more when passing through smaller openings
• In destructive interference, the crest of one wave aligns with the trough of another.

  True
• In acoustics, constructive interference amplifies sound, while destructive interference can cancel it out.


  True
• Refraction occurs when a wave changes direction
• In reflection, a wave changes direction but not speed.


  True
• Match the wave behavior with its application:

  Reflection ↔️ Mirrors

  Refraction ↔️ Lenses

  Diffraction ↔️ Optical devices

  Interference ↔️ Holograms
• Wavelength is the distance between two consecutive crests or troughs.

  True
• Waves propagate faster in mediums with higher density and elasticity.

  True
• In reflection, the angle of incidence is equal to the angle of reflection
• What atmospheric phenomenon is caused by refraction?

  Mirages
• When a wave moves from a less dense to a denser medium, its speed increases.

  False
• What type of waves diffract more, longer or shorter wavelengths?

  Longer wavelengths
• What are the two main types of interference?

  Constructive and destructive
• In reflection, the angle of incidence equals the angle of reflection.


  True
• Arrange the main types of wave behavior in alphabetical order.

  1️⃣ Diffraction

  2️⃣ Interference

  3️⃣ Reflection

  4️⃣ Refraction
• What happens to a wave when it diffracts around the edge of an obstacle?

  It bends around the edge
• The unit for wave speed is m/s
• Amplitude is the maximum displacement of a wave from its equilibrium
• What is the key characteristic of reflection?

  Angle of incidence equals reflection
• When a wave moves from a less dense to a denser medium, it bends towards the normal.


  True
• Refraction is the bending of a wave as it moves from one medium to another with different densities
• Match the medium type with the wave behavior.

  Denser Medium ↔️ Wave bends towards normal

  Less Dense Medium ↔️ Wave bends away from normal
• Lower-pitched sounds diffract more through a doorway than higher-pitched sounds.


  True