Chapter 7 - Waves And Sounds

Question 1

Transverse wave

Answer 1

Those in which direction of a particle oscillation is perpendicular to the propagation (movement) of the wave

Stadium wave is good analogy:
- people don’t move along with wave

Exemples:
Electromagnetic waves ..visible light, microwaves and X-rays

Question 2

Longitudinal waves

Answer 2

Particules of the wave oscillate parallel to the direction of propagation

• sound waves

Question 3

Frequency

Answer 3

Number of wave lengths passing through a fixed point per second (hz)

V = f*lamda

Question 4

What is the period

Answer 4

Period (T) is the inverse of F

T= 1/f

Question 5

Traveling wave

Answer 5

Think of a string fixed at one end but moved up and down from the other end. the wave moves towards the fixed point

Question 6

What frequencies are audible to healthy adults ?

Answer 6

20 Hz to 20,000 Hz

Question 7

What type of wave is sound?

Answer 7

Longitudinal

Question 8

What is the equation for speed of sound

Answer 8

V = (B/density)^(1/2)

B = bulk modulus, mediums resistance to compression

P: density of medium

Question 9

What is the bulk modulus and does it increase or decrease going from gas to solid?

Answer 9

Measure of mediums resistance to compression

• increases from gas to liquid

Question 10

Pitch

Answer 10

Our perception of frequency

Question 11

Write out the Doppler effect equation

Answer 11

F’ = f((v-Vd)/(v-Vs)

Top sign “toward”
Bottom sign away