Sound Waves Quiz

Sound Waves and Acoustics

• The frequency range for sound waves that elicit an auditory percept in humans is not specified (but typically 20 Hz to 20,000 Hz).
• Sound waves above 20 kHz are known as ultrasound.
• The interdisciplinary science that deals with the study of mechanical waves in gasses, liquids, and solids including vibration, sound, ultrasound, and infrasound is acoustics.
• A scientist who works in the field of acoustics is called an acoustician.

Magnetism

• Electric currents give rise to a magnetic field.
• Ferromagnetic materials (such as iron, nickel, and cobalt) are strongly attracted by magnetic fields and can be magnetized to become permanent magnets.
• Paramagnetic substances (such as aluminum and oxygen) are weakly attracted to an applied magnetic field.
• Diamagnetic materials (such as copper and silver) are weakly repelled by a magnetic field.
• Electric currents are responsible for most of the effects of magnetism encountered in everyday life.

Subfields of Acoustics

• One subdiscipline of acoustics is audio engineering, concerned with the recording, manipulation, mixing, and reproduction of sound.