P1.4 Flashcards
What are the most common uses of infrasound? (3)
a) communication between animals
b) detection of animal movement in remote locations
c) the detection of volcanic eruptions and meteors
What is infrasound?
Sounds with frequencies less than 20Hz
What is the equation for wave speed when given frequency and wavelength?
Frequency (hertz, Hz) x wavelength (metre, m)
V=f x h
What is the equation for wave speed when given distance and time?
Distance (metre, m) / time (second, s)
V =__x___
t
What is ultrasound?
Sound waves with frequencies greater than
20 000 Hz
(20kHz)
What are the common uses of ultrasound?
a) sonar
b) communication between animals
c) foetal scanning
How are seismic waves generated?
By earthquakes or explosions
What kind of seismic wave is longitudinal?
P waves
What kind of seismic waves transverse?
S waves
Where can seismic waves be refracted/reflected?
At boundaries between the crust, mantle and core
