17. What is the definition of amplitude? 18. In a sample of air, how does a lower amplitude differ from a higher amplitude?

19. Will the wave traveling through air represented by the sample on the left or the right sound louder? Why?

20. What are two ways to increase the energy of a wave?

Extending the Senses:
21. What is sonar used for, and how does it work?

22. What is a seismograph used for, and how does it work?

Use the drop-down menus to match each part of the scenario to the correct scientific practice. akira records the speed of a reaction without a catalyst and then with a catalyst. akira creates a reaction without a catalyst and repeats the reaction with a catalyst. akira turns in a written lab report to his science teacher. akira wonders, "will adding a catalyst speed up this chemical reaction? " akira writes in his notes that adding a catalyst sped up the chemical reaction because the catalyst lowers the activation energy needed to get the reaction started.