Topic 6

• What is a perfect black body in terms of radiation?

  It absorbs all radiation without reflection
• What is the relationship between the angle of incidence and the angle of reflection?

  Angle of incidence equals angle of reflection
• What type of image can a convex lens produce?

  Real or virtual image
• What is the formula for wave speed?

  Wave speed is $v =$$f\lambda$
• What does frequency (f) represent in wave properties?

  Number of oscillations per second
• What is the period (T) of a wave?

  Time taken for one wavelength to pass
• What is the amplitude of a wave?

  Max displacement from rest
• How does refraction occur in waves?

  Waves change speed when entering a different medium
• What happens to wave speed when it moves towards the normal?

  Wave speed decreases
• What happens to wave speed when it moves away from the normal?

  Wave speed increases
• What is the audible range of sound?

  20 Hz to 20 kHz
• What is ultrasound?

  Sound above the frequency of human hearing
• What type of waves are P-waves?

  Longitudinal seismic waves
• What type of waves are S-waves?

  Transverse seismic waves
• What are electromagnetic waves?

  Waves that can travel through a vacuum
• What is the range of wavelengths visible to the human eye?

  The visible spectrum of light
• What is the effect of ionizing radiation?

  It can cause mutations and lead to cancer
• What is the use of infrared waves?

  Heaters and infrared cameras
• What is the use of microwaves?

  Cooking food and communications
• What is the use of radio waves?

  Television and radio communication
• What is the order of electromagnetic waves from low to high frequency?

  • Radio Waves
  • Microwaves
  • Infrared
  • Visible Light
  • Ultraviolet
  • X-Rays
  • Gamma Rays
• What are the properties of waves?

  • Frequency (f)
  • Wavelength (𝜆)
  • Speed (v)
  • Period (T)
  • Amplitude
• What are the differences between longitudinal and transverse waves?

  • Longitudinal: Oscillations parallel to energy transfer
  • Transverse: Oscillations perpendicular to energy transfer
• What is the continuous spectrum in relation to waves?

  • A range of wavelengths without gaps
  • Includes all types of electromagnetic radiation