Nature of Waves
Waves transfer this, NOT matter.
What is Energy?
The _______ at which a wave travels is called frequency.
What is speed?
The bouncing off waves, or an echo, is this type of wave interaction.
What is reflection?
The highest point of a wave is called ________.
What is a crest?
The musical note A above middle C has a frequency of 440 Hz. If the speed of sound is known to be 350 m/s, what is the wavelength of this note?
λ=440 Hz350 m/s
λ≈0.795 m
Energy is the transfer though the __________ of particles.
What is vibration?
Frequency is measured in this unit.
What is Hertz?
The bending of a wave between two different mediums is this.
What is refraction?
The lowest part of a wave is called a ________.
What is a trough?
The lowest pitch that the average human can hear has a frequency of 20.0 Hz. If sound with this frequency travels through air with a speed of 331 m/s, what is its wavelength?
λ=20.0 Hz331 m/s
λ=16.55 m
Waves that require a ___________ are called mechanical waves.
What is a medium?
The natural or resting point of a wave is called the _____________.
What is an equilibrium?
__________ is the change of direction as waves encounter obstacles, edges, or openings.
What is diffraction?
The distance between two corresponding points of two consecutive waves is called ____________.
What is a wavelength?
A 10.0 m wire is hung from a high ceiling and held tightly below by a large mass. Standing waves are created in the wire by air currents that pass over the wire, setting it in motion. If the speed of the standing wave is 335 m/s and its frequency is 67 Hz, what is its wavelength?
λ=67 Hz335 m/s
λ=5.0 m
A medium can consist of a solid, liquid or this third state.
What is gas?
A _________ wave is also a sound wave.
What is a longitudinal?
This interaction occurs when the crests of two different waves overlap.
What is constructive interference?
The maximum displacement from the rest point of a wave is called a(n) ________.
What is amplitude?
A buoy bobs up and down in the ocean. The waves have a wavelength of 2.5 m, and they pass the buoy at a speed of 4.0 m/s. What is the frequency of the waves? How much time does it take for one wave to pass under the buoy?
f = 4.0/2.5 = 1.6 HZ
T = 1/1.6 = 0.625 s
These are the two types of waves.
What is a transverse wave and a longitudinal wave?
A longitudinal wave requires a ____________ to transfer energy.
What is a medium?
This type of wave will always have components in a standing position.
What is a standing wave?
The number of waves to pass through a given time is measured by a ____________.
What is a period?
Cicadas produce a buzzing sound that has a wavelength in air of 2.69 m. If the speed of sound in air is 346 m/s, what is the frequency of the sound produced by a cicada? What is its period?
f = 346/2.69 = 128.6 Hz
T = 1/128.6 = .00778 s