Waves-2

Waves-2

1. Pitch and Loudness

   • Increasing frequency of a sound will increase the pitch
   • Increasing the amplitude of a sound increases the volume

2. Electromagnetic spectrum

   • Rabid Monkeys In Velvet Underpants eXcrete Gummy bears
     • Radio Waves
       • Lowest energy and frequency but longest wavelenth
       • Used in communications- travel long distances reflecting of hills etc.
       • Can cause cancer
     • Microwaves
       • cause water and fat molecules to vibrate, causing the substance to heat up
       • Traffic cameras and radars
       • Cataracts and brain damage
     • Infrared radiation
       • Given off by anything that is warm
       • remote controls, video recorders and heat lamps
       • Short range communications
       • Thermal imaging
       • Over-heating
     • Visible Light
       • What we can see
       • Lasers are used in DVD players and printers and weapon aiming systems
       • Damage retina
     • Ultraviolet
       • Given off by special types of lamps
       • Sun-tan, detecting forged bank notes, hardening dental fillings
       • Damage retina, sunburn, skin cancer
     • X rays
       • Can pass through most substances
       • X-Ray machines, passes easily through tissue but not easily through bone
       • Airport security
       • Cell damage
     • Gamma Rays
       • High frequency, hard to stop
       • Kills cancer cells, used to sterilise food and equipment
       • Cell damage, mutations

3. Ultra-sound

   • Sound higher than 20,000Hz
   • Fetal scanning,sonar, medical diagnosis, medical treatment

4. Analogue and Digital

   • Analogue
     • Has a continuous range
     • sound light, temperature
   • Digital
     • Modern communications
       • Binary
       • Discrete signal
       • Can send more than one signal- multiplexing

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