12 What do you need in order to start any sound?
14 All sound is caused by …
16 First you need energy to create a vibration. Then the molecules of the object vibrate. What happens next?
17 The vibrations of those moving molecules are transferred to the air molecules.
18 Sound travels in what form….
19 Sound waves
20 Sound cannot travel in this medium
21 A vacuum (space is an example of a vacuum)
22 If I blow the top instrument, then the bottom one, Ive made a change in frequency or amplitude?
23 Frequency. The difference in length affects the pitch (which is the same as frequency).
24 If I increase the amplitude I am increasing the volume – true or false?
25 True! Amplitude & volume are related Remember, Amp it up!
26 If I increase the intensity, Im also increasing the_____ of the sound.
27 Energy, volume, amplitude (any or all is acceptable)
28 Sing ONLY the first two words – twinkle, twinkle of Twinkle, Twinkle Little Star. Youve just made a change in ________
29 Pitch or frequency
30 The faster an instrument vibrates, the higher the __________ of the sound it makes.
31 Pitch or frequency Think: its vibrating more frequently, so its increasing its frequency
32 What sounds higher in pitch, a wide rubber band or a thin rubber band?
33 A thin rubber band
34 Whats lower in pitch, a tight string or a loose string?
35 A loose string
36 Whats higher in pitch, a long organ pipe or a short one?
37 A short one
38 If I do this to the drum skin, I will make it sound higher in pitch
39 Tighten it
40 If I decrease the pitch, I am also decreasing the _______ of sound
42 Reflect means….
43 To bounce off of something
44 Absorb means….
45 To take in or soak in
46 Which reflects sound best? A brick wall or a stack of books.
47 A brick wall
48 Which absorbs sound better, a carpet or a wall?
49 A carpet
50 In most cases, the better room for an echo is the family room or the bathroom? Why?
51 The bathroom. Places that are empty with flat surfaces and not a lot of soft things to absorb sound reflect best. A family room will likely have carpet, sofas, several people. A bathroom has tile, flat, hard surfaces, and not a lot in it to absorb sound.