Chapter 7- Waves And Sound Flashcards Preview

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Flashcards in Chapter 7- Waves And Sound Deck (24)
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1

What type of wave is sound?

Longitudinal wave

2

Transverse wave

Like people doing the wave in a stadium. Each person being a particle moving up and down (perpendicular)
Ex: electromagnetic waves

3

Transverse wave and energy

Particles oscillating perpendicular to the direction of energy transfer

4

Longitudinal waves and energy

Particles oscillate parallel to direction of energy transfer
Ex: sound waves

5

Speed of wave

v = f(wavelength)

6

Period of wave

T = 1/f

7

Angular frequency

Used in simple harmonic motion in springs and pendula
w= 2(pi)f = 2(pi)/T

8

Timbre

Quality of sound. Determined by natural frequency of the object

9

Audible frequency

Between 20 and 20,000 Hz

10

2 types of waves

1. Transverse
2. Longitudinal

11

Speed of sound

Square root(B/density)

12

Doppler equation

Detector / source

13

Intensity

Pressure / Area

14

Sound level

B = 10 log(I/I*)

I*- 1 x 10^-12

15

Effects of dampening / attenuation

Same frequency (pitch), gradual loss of sound (smaller amplitude)

16

Wavelength of standing wave

2L/n

n- number of half-wavelengths supported by the string

17

Possible frequencies

f = nv/2L

18

Fundamental frequency

First harmonic. Lowest frequency (longest wavelength) of a standing wave that can be supported in a given string.

19

For strings attached at both ends how do you know which harmonic it is?

Number of antinodes

20

For open pipes how can you tell which harmonic it is?

Number of nodes present

21

Closed pipe equation for wavelength

4L/n

n- odd numbers only, quarter wavelengths

22

Frequency of standing wave in a closed pipe

nv/4L

23

Ultrasound machines calculate distance based on...

Travel time of the reflected sound

24

Pitch

Related to frequency