Examlex
Which group is more likely than the average Canadian to have a university degree?
Sound Waves
Mechanical vibrations that travel through a medium such as air, water, or solid materials, and can be heard when they reach a human or animal ear.
Pulses
Rapid, transient changes in the amplitude of an electrical signal, often used to convey information or trigger specific actions in electronic devices.
Pressure Switch
A device that activates or deactivates electrical contact in response to changes in pressure level.
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