Chapter 3 Flashcards
Calculate the wavelength in meters of a sound whose frequency is 790Hz. Round 3 decimal places.
0.43
All other things being equal, if the frequency is doubled, what happens to the period?
It’s halved
What is 20.1 + 5.0 * 113.9? Please use correct scientific notation and round to the first decimal (Example: 2.1x10^3)
5.9 x 10^2
Express the answer in scientific notation: 10.0 + 186.2 x 24
4.5 x 10^3
Conversion of energy from one form to another is known as ___________. An example of this would be a hearing aid because it changes sound into an electrical signal.
transduction
What is the correct scientific notation of 24,000?
2.4 x 10^4
What is the wavelength in meters of a sound whose frequency is 2 kHz?
0.17
Measured sound pressure is 50 micropascals at 6 meters from the source. What is the sound pressure of the same sound at 30 meters from the source in micropascals?
2
If the frequency is doubled, what happens to the period?
It’s halved
If the frequency is halved, what happens to the wavelength?
It doubles
If the period is doubled, what happens to the speed of sound?
No change
If the speed of sound is halved, what happens to the period?
No change
If the speed of sound is doubled, what happens to the wavelength?
It doubles
What is the unit for speed of sound?
m/sec
What is the unit for frequency?
Hz (cycles/sec)
What is the unit for period?
sec or msec
What is the unit for wavelength?
meters or any unit of length
What is the unit for phase?
degree of arc
What is the amplitude for sound waves in the air?
Pa
The Inverse Square Law accounts for obstacles in the area. (T or F)
False
Calculate the wavelength in meters of a sound whose frequency is 1,000Hz.
0.343
How many significant digits does each of the following numbers have?
A) 0.0037
B) 8000.1
C) 2.9
D) 32.00
E) 12.009
F) 0.00320
A) 2
B) 5
C) 2
D) 4
E) 5
F) 3
Simple harmonic waves are aperiodic or periodic?
periodic
Number: 9.22 x 10^-2
Which one of these numbers is base? Which is the coefficient?
Base: 10
Coefficient: 9.22
