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### 45 True/False questions

1. Mechanical Wavesrequire a medium to travel through (water and sound waves)

2. Diffractionbending of a wave as it passes at an angle into another medium

3. Quality of Soundrange of frequencies above 20,000 Hz. Many animals can hear thes frequencies

4. Reflectionbending of a wave as it passes at an angle into another medium

5. Medium2 sound waves close in frequency prducing an oscillating sound wave

6. Frequencynumber of waves passing each second, measured in hertz

7. Amplitudewave undergoes maximum displacement

8. Dampingsubstance that the wave is passing through

9. Doppler Effectchange in frequency heard when the source of sound and the person recieving the sound are in relative motion

10. Threshold of Pain120 dB over a long period of time

11. Standing waveinterference pattern produced when 2 waves of the same frequency and wavelength pass each other

12. Rectilinear propagationanimals like bats send out ultrasonic frequencies and "hear" the reflection to determine if an object is near

13. Harmonicswhole number multiples of the fundamental frequency

14. Refractionwaves will bounce off barriers at an angle equal to the angle they will strike the barrier

15. Explain how the ear detects sound."Angle of incidence= Angle of reflection"

16. Construction Interferencewaves add as they meet

17. Sympathetic Vibrationsoccurs when a standing sound wave is produced in a tube causing the tube to produce an amplified sound

18. Ultra Sonicrange of frequencies below 20Hz

19. Law of Reflectionwaves will bounce off barriers at an angle equal to the angle they will strike the barrier

20. How is sound produced and transmitted?decibel scale, can also be called relative intensity

21. Infra Sonicrange of frequencies above 20,000 Hz. Many animals can hear thes frequencies

22. Wavelengththe distance from a point on one wave to the identical point on the next wave

23. Law of Strings"Angle of incidence= Angle of reflection"

24. Audio Spectrumpart of the sonic spectrum that humans can hear frequencies between 20Hz and 20,000Hz

25. Intensitypower of the sound wave passing through an area

26. Fundamental frequencynumber of waves passing each second, measured in hertz

27. Explain behavior of waves at different boundarieswhen a wave strikes a rigid barrier, it reflects inverted. When it strikes a non-reigid barrier, it reflects upright

28. Electromagnetic Wavesrequire a medium to travel through (water and sound waves)

29. Pitcha disturbance passing through a medium or space

30. Interferencethe effect of 2 waves passing each other as described by the principle of Superposition

31. Threshold of Hearingdecibel scale, can also be called relative intensity

32. Sonic Spectrumcomplete range of the longitudinal waves

33. Beat2 sound waves close in frequency prducing an oscillating sound wave

34. Nodea disturbance passing through a medium or space

35. Echo Locationwaves will bounce off barriers at an angle equal to the angle they will strike the barrier

36. Antinodewave undergoes no displacement

37. Impedancehow easily or difficultly a wave can be launched in a medium

38. Principle of Superpositionwave swill travel in straight lines or paths in a uniform medium

39. Loudnesssubjective perception of intensity

40. Wavea disturbance passing through a medium or space

41. Relative Intensitycompares the intensity to the softest sound or "threshhold of hearing"

42. Compare the velocity of sound in solids, liquids, gases and space.sound is produced by vibration, a vibrating object will send out a wave, the faster the object vibrates, the higher the frequency

43. Longitudinal Wavesparticals on these waves vibrate parallel to the direction that the wave is moving

44. Transverse Wavesparticles on the wave vibrate perpindicular to the direction that the wave is going

45. Destructive Interferencethe waves partly or completely cancel as they pass