Properties of waves
The three properties related in the wave equation.
What are frequency, wavelength, and velocity?
The line that is perpendicular to a boundary between media.
When waves add to produce a wave with a larger amplitude.
What is constructive interference?
Occurs when a wave reflects upon itself and interference causes a pattern.
What is a standing wave?
The wavelength of a 215 Hz sound that you hear in the classroom.
What is 1.61 m?
Sound travels faster in most solids than in air because of this property.
What is elasticity?
In a reflection, the angle of reflection is equal to this angle.
What is the angle of incidence?
Interference when a crest overlaps a trough.
What is destructive interference?
Location of a standing wave where there is no displacement.
What is a node?
The effective length of a flute playing a note with a frequency of 440 Hz, without overblowing.
What is 0.392 m?
Two properties of waves that describe the direction of the oscillation as compared to the velocity.
What are transverse and longitudinal?
When a wave enters a medium in which it travels more slowly, the wave bends in this direction.
What is towards the normal?
When two waves interfere, the sum of the displacements of the individual waves.
What is superposition?
How to calculate the wavelength of a standing wave in a string.
Double the length divided by the number of the harmonic.
The number of nodes seen on a string vibrating at the 5th harmonic.
6 nodes (including the two ends) or 4 nodes (not including the end nodes).
A particular point within a period of a wave.
What is phase?
The name for the incident angle when the angle of refraction is 90 degrees.
What is the critical angle?
When two speakers play an identical frequency, what is the difference in path length to an observer such that no sound is heard? State in terms of wavelength.
What is wavelength * (n-1/2) where n is 1,2,3...
How to calculate the wavelength of a standing wave in a closed pipe.
2*L/(2n-1) where n is 1,2,3... (or 2*L/n where n is 1,3,5...)
A frequency of vibration for at a violin string which is 52.0 cm and the tension in the string causing waves to propagate at 256 m/s along it.
What is 246 Hz, 492 Hz, 738 Hz ...?
The difference between the maximum and minimum displacement divided by two.
What is amplitude?
The property of a wave that remains constant when entering a boundary.
What is frequency?
The frequency of the beats when a 440 Hz and a 456 Hz sound are played at the same time.
What is 16 Hz?
A specific frequency that causes a system to oscillate at large amplitudes.
Resonance.
An observer stand 3.68 m from one speaker and 2.80 m from a second speaker, both playing a 2160 Hz sound. Will the observer hear the sound?