09 sci light + sound key questions

• Translucent


  Some light may pass through
• Opaque


  No light passes through
• Properties of light


  • Wavelengths
  • Frequency
  • Energy
  • Speed
• Light


  Composed of energy particles called photons
• Incident ray


  Light ray that is moving towards a mirror
• Angle of reflection


  Angle between the normal and reflected ray
• Angle of incidence


  Angle between the normal and incident ray
• What is a concave mirrorused for

  Used for cosmetic purposes
• What is a convex mirrorused for

  Used for shop security mirrors and rearview mirrors in cars
• Focal point of concave vs convex mirrors

  Concave is at the front of the mirror, convex at the back
• Gamma rays


  Used for cancer treatment and in the medical field
• 1. rays


  Used for medical and security purposes
• Ultraviolet rays


  Used for tanning beds and fluorescent lighting
• Infrared light


  Used for remote controls and heat detection
• Radio waves


  Used for communication and broadcasting
• Critical angle


  The last possible angle where refraction can still occur
• Primary colours


  • Red
  • Blue
  • Green
• Secondary colours


  • Magenta
  • Cyan
  • Yellow
• Binocular vs monocular vision

  Binocular vision uses both eyes, while monocular vision uses only one eye
• Light vs sound


  Light travels faster
• Speed of light


  300,000,000 m/s
• Speed of sound


  330 m/s
• Sound cannot travel through space because space is a vacuum and sound requires particles to vibrate and transmit energy
• Sound travels


  Faster through solid than gas
• Wavelength and frequency


  They are inversely proportional
• Frequency


  The number of waves per second, measured in Hertz (Hz)
• the bigger the Amplitude The louder the volume
• Cornea


  Clear tissue that covers front of the eye
• Pupil


  Opening through which light enters the eye
• Iris


  Coloured part of the eye, controls the amount of light entering the eye
• Lens


  Focuses light on the retina, image is upside down
• Retina


  Layer of light sensitive cells at the back of the eye which responds to light. Rods and cones send electrical impulses to the optic nerve
• Optic nerve


  Sends signals to the brain
• Wavelength


  The shorter the wavelength, the higher the frequency
• Camera iris


  Similar to the human iris
• Camera aperture


  Similar to the human pupil
• Camera diaphragm


  Similar to the human eyelid
• Camera lens


  Similar to the human cornea and lens
• Camera film


  Similar to the human retina
• Visible light


  In-between ultraviolet and infrared light in the electromagnetic spectrum