Basic acoustics Oct 2

Question 1

what are the 2 different types of waves and what do they have in comparison.

Answer 1

• Transverse: particles move upward and downward in perpendicular motion
• Longitudinal: particles move forward and backward
• In both the particles do not travel but the waves do.

Question 2

how are tranverse and longitudinal waves similar to the wave done at sports games

Answer 2

particles go up AND down like doing the wave at a game where you stand and sit. The wave is moving but the particles are moving only w/in their own range. So when we speak the air particles push against the other to make the other push and so on, the wave is moving not the particles.

Question 3

what is wavelength

Answer 3

the measurement from peak to peak or valley to valley or zero to zero.

Question 4

what is amplitude

Answer 4

point from peak/valley to zero

Question 5

what is displacement

Answer 5

the point from peak to valley

Question 6

both transverse waves and longitiudinal waves follow what principle of

Answer 6

Simple sine waves

Question 7

poll question: a greater absolute amplitude value in a transverse wave is analogous to greater compression area in a longitudinal wave
a. agree
b. disagree

Answer 7

a.

Question 8

what are characteristics of simple waves

Answer 8

Frequency - # of times the cycle happens in seconds/ measured in hz
Amplitude - how strong are the oscillations/ measured in dB
phase - when did the wave start/often measured in degrees and relative to another wave.w

Question 9

what is the frequency formula

Answer 9

If 1 cycle = 10 ms
- duration of 1 cycle = 10 ms
- 1 sec = 1000 ms
- cycles in 1000 ms = (1000/10) = 100 (hz)