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?

Indicate whether the following statements about the biases in the fossil record are true or false. a) inland species are more likely to be preserved than marine species b) organisms with hard body parts are more likely to be preserved than are those composed soft tissues. c) species that existed over a larger area are more likely to be preserved than species existing over a smaller area. d) organisms that lived very long ago are more likely to be found as fossils than organisms that lived relatively recently e) the fossils of larger organisms are more likely to be found than the fossils of smaller organisms

Which of the following is an effect of the uneven heating of the earth by the sun? a sea breeze a land breeze a convection current all of the above

Awave has a wavelength of 15 mm and a frequency of 6 hertz. what is its speed?