Topic 4 🌊📡 Flashcards
What is the wavelength?
Distance from one point to the same point on the adjacent wave
What is velocity (v) of a wave?
The rate that the wave travels
What is the frequency of a wave?
Number of waves that pass a given point in a second
1Hz =
1 wave each second
What is a Period (T) of a wave?
Time taken for a complete wave to pass a given point
Explain.
F = 1/T
Frequency is the reciprocal of the period
What are water waves?
Floats on water will pop up and down when the wave passes. The wave is transferred, but the medium is not
What is amplitude?
Maximum displacement of a wave from its rest position
For sound waves, amplitude determines the
Volume of the sound
What is the wave front?
A line where all the oscillations of the wave are in phase (all at the same position in their cycle)
What is a longitudinal wave?
Oscillations parallel to the energy transfer
What is a transverse wave?
Oscillations perpendicular to the energy transfer
Electromagnetic radiation is a form of ______ wave?
Transverse
Compressions and rarefactions are used to describe _____ waves?
Longitudinal
What frequency does ultrasound have?
> 20,000 Hz
What can ultrasound be used for?
Foetal Scanning
How does foetal scanning work?
Waves travel from emitter and are reflected at boundaries inside body.
Reflected waves are detected to form an image of the womb
What frequency is infra sound?
< 20 Hz
What sound waves pass through earths core?
Infrasound waves in particular seismic waves
What is the human audible range?
20 Hz - 20 kHz
What is Sonar? And how is it used?
Use the sound waves that are within the audible range. Are used to measure the depth of things underwater.
