Physics - N5

• Look at photos for tables...

  Photos
• What are the 10 types of energy?


  Kinetic, Chemical, Elastic- Potential, Gravitational potential, heat, light, sound, nuclear, electrical, magnetic.
• How to you calculate speed?

  V=d/t, d=Vt, t=d/V
• What do all waves do?

  Transfer energy
• What do waves travel through?

  The medium
• What is the frequency?

  The numbers of waves per second
• How do you calculate the frequency?

  F=(N) number of waves/ (T) time s
• What is frequency measured in?

  Herts (Hz)
• What is the wave length?

  The wave length is the MINIMUM distance the wave repeats itself.
• What is wavelength measured in?

  Lanbda /\ and measured in metres
• What is a longitudinal wave?

  When the particles in the medium oscillate in the same direction as the energy is transferred.
• What is a transverse wave?

  A wave in which the particles in the medium oscillate at right-angles to the direction of the energy transfer.
• What is the speed of the wave measured in?

  Ms-1
• How do you calculate the period of a wave?

  T=1/f (frequency =2 wps 1/2)
• What's the period of the wave?

  The time for one wave to pass a point
• What is the speed of sound?

  330ms-1
• What is the speed of light?

  300,000,000ms-1 / 3.0x10 8ms-1
• What happens to the frequency if the wave length reduces?

  The frequency increases
• What is the wave equation?

  V=f/\
• What frequency can humans hear sound?

  20Hz-20,000Hz
• What is the difference between infrasound and ultra sound?

  <20Hz = Infrasound >20,000Hz Ultrasound
• What is sound measured in?

  It is measured in dB
• What is ultrasound?

  Sound above the frequency of human hearing.
• How is ultrasound used to view baby's?

  A gel is applied on the belly to create an air free contact the transducer sends the ultrasound and when that reaches the types of tissue it echos creating an image.
• what's the equation to figure out the distance to the baby's head?

  d=vt —-> d/2
• What are other uses for ultrasound?

  Doppler is used to monitor blood flow through heat, Lithotripsy is height intensity ultrasound to treat kidney stones.
• What is diffraction?

  The bending of waves around an object or barrier.
• Angle of incidence=

  =angle of reflection
• Where do all diffracted rays head to?

  The focus point.
• What is refraction?

  When a beam of light changes direction when it changes medium.
• How small can the angle be for all light to be refracted?

  42 degrees.
• What is the order of radiation types?

  Gamma rays, x-rays, ultraviolet, visible light, infrared, microwaves, radio waves. (Gm=highest frequency)
• What are radiowaves?

  Detect = a dish that reflects the waves onto the detector (radio telescope), Sources = mobile phones, Uses = radios
• What are microwaves?

  Detect = a satellite, Sources = microwaves, Uses = phone calls, heating up food
• What is infrared?

  Detect = thermograms (uses radiation instead of light to take photo), Sources = everything that produces heat, Uses = Night vision, detect tumours, heat up muscles
• What is visible light?

  Detect = eyes, Sources = laser beam, Uses = seal blood cells and laser eye surgery
• What is ultraviolet?

  Detect = UV detector, Sources = the sun, Uses = killing bacteria dentist, suntanning
• What are x-rays?

  Detect = Geiger Counter, Sources = space rays, Uses = to see inside the human body
• What is an example of a longitudinal wave?

  sound waves
• Who discovered radiation?

  Henri Becquerel