DC -- standing waves

Headphones designed to cancel noise with destructive interference create a sound wave ____________.

• exactly opposite to the incoming sound.

• exactly in phase with the incoming sound.

• half the amplitude of the incoming sound.

All sound resonances are due to ---

• Reflection of sound waves

• Amplification of sound waves

• Absorption of sound waves

• Constructive and destructive interference

Which frequencies interfere constructively to form standing waves?

• Harmonic

• Oscillatory

• Resonant

• Refractive

Maximum air displacement in a tube at the open end (as shown in the diagram)

• Antinode

• Frequency

• Node

• Wavelength

The distance from a node to an antinode is ---

• half the frequency

• double the frequency

• 1/4 of a wavelength

• twice the amplitude

The lowest resonant frequency

• Overtone

• Fundamental

• Pitch

• Interval

All resonant frequencies are integral multiples of the fundamental, and they are collectively called --

• Overtones

• Intervals

• Octaves

• Harmonics

the driven or forced oscillation of a system at its natural frequency

• Reflection

• Refraction

• Resonance

• Diffraction