Physics

Physics

1. Waves curves as they travel through the earth because the density change the speed therefore direction of the waves

   • Transverse
     • Rope
     • Water
     • Radio/light
     • Oscillation is perpendicular to direction of wave
   • Longitudinal
     • Sound
     • Sizemic
       • We can work out the earths core by using sizemic waves
     • Oscillation is perpendicular to direction
   • Reflection is when waves hit a surface at a non- zero degree they are reflected, the angle of reflection is equal to the angle of incidence
   • When waves travel from deep to sallow water the change speed and direction this is called refraction
   • Wave length calculations
     • Frequency= waves per second (Hertz Hz)
       • Frequency =waves/time
     • Velocity(m/s)= frequency * wave length
     • Time period= 1/frequency = time for one occillation
     • Speed = distance/time
     • Wave speed= frequency*wavelength
   • Echo location
     • Time it takes to travel back to its source from a reflected surface, is measured and used to calculate distance.
     • There and back
   • Ultrasound waves
     • Ultrasound
       • Frequency higher than 20,000Hz
       • Ultrasound can be used to look at different tissues and organs
     • Echo sounding
       • Used to search for oil and gas
       • Used to measure depth of sea bed
   • P waves
     • Fast, longitudinal
       • Can go straight through liquid
   • S waves= secondary waves
     • Cannot go straight through liquid