1. 1 of 7© Boardworks Ltd 2015

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3. 3 of 7© Boardworks Ltd 2015 Progressive and stationary waves If two progressive waves of the same frequency travel in opposite directions, a stationary (or standing) wave is produced. Stationary waves are not literally stationary, but in contrast to progressive waves, energy is stored and not transmitted. node – no displacement occurs antinode – maximum displacement occurs

4. 4 of 7© Boardworks Ltd 2015 Investigating stationary waves

5. 5 of 7© Boardworks Ltd 2015 Fundamental frequencies

6. 6 of 7© Boardworks Ltd 2015 Measuring the speed of sound

7. 7 of 7© Boardworks Ltd 2015 Stationary waves: true or false?