Apologia Physical Science Module 14

transverse wave

a wave with a direction of propagation that is perpendicular to its direction of oscillation

longitudinal wave

a wave with a direction of propagation that is parallel to its direction of oscillation

supersonic speed

any speed that is faster than the speed of sound in the substance of interest

sonic boom

the sound produced as a result of an object traveling at Mach 1 or above

pitch

an indication of how high or low a sound is which is primarily determined by the frequency of the sound wave

v:

(331.5 + 0.6 x T)

are sound waves transverse waves or longitudinal waves

longitudinal waves

crests

the highest point on a wave

troughs

the lowest point on wave

frequency

how many waves hit a certain point each second

amplitude

the height of the wave

pitch is determined by what?

frequency

frequency determines what?

wavelength

Amplitude determines what?

loudness

volume is determined by what?

amplitude

sound is a...

longitudinal

sound waves with low pitch...

have low frequency

sound wave with high pitch...

have high frequency

infrasonic waves

with frequencies below 20 Hz

sonic waves

have frequencies between 20 and 20,000 Hz

ultrasonic waves

have frequencies higher than 20,000 Hz

frequency formula

f=velocity/wavelength

distance formula

d=speed*time

Mach 1

the speed of sound

Mach 2

twice the speed of sound

Mach 3

three times the speed of sound

30 decibels = _______bels

3

If an amplifier increases the sound from 2 bels to 5 bels, this results in how many times larger intensity?

1,000 (three zeros)