SOLVING

• How many periods are there in Figure A?


  Ans: Period (T)= 5 seconds

  
• What is the frequency of Figure A? Show solution

  Ans:

  f= 1/T

  =1/5 seconds

  = 0.2 Hz

  
• The sound has a frequency of 426 Hz. What is the period?

  ans: 0.02 seconds
• A hiker shouts toward a cliff. The returning echo has a frequency of 20.0Hz. Find the period.

  ans: 0.05 seconds
• Speed: The speed or velocity of a wave is how fast the energy is moved.
• Of the three mediums (gas, liquid, and solid) sound waves travel the slowest through gases, faster through liquids, and fastest through solids.
• A wave has a frequency of 900Hz and a wavelength of 200m. At what

  speed is this wave travelling?

  Given:

  f = 900Hz

  lambda =200m

  
  

  Unknown:

  v=?

  
  

  Formula:

  v= flambda

  
  

  Solution:

  v= 900Hz * 200m

  v= 180,000m/s