Wave Properties
A wave that moves in the direction perpendicular to the movement of the wave source is called…
a transverse wave
How does frequency relate to the speed and length of a wave?
The frequency is equal to the speed divided by the wavelength.
Two waves interfere to form a resultant wave with greater amplitude than either of the original waves. This was a result of…
constructive interference
In a standing wave, these points experience almost no displacement because the interfering waves are always out of phase at those locations. What are they called?
Nodes
Sound travels as what type of wave?
Longitudinal
A wave that moves in the direction parallel to the movement of the wave source is called…
a longitudinal wave
If the speed of sound remains constant and the frequency of a sound wave increases, what happens to the wavelength?
The wavelength decreases
The principle that states "when two or more waves overlap in the same medium, the resulting displacement at any point is the algebraic sum of the displacements of the individual waves" is called...
the principle of superposition
In a standing wave, these points experience maximum displacement because the interfering waves are always in phase at those locations. What are they called?
Antinodes
If the frequency of a sound wave decreases, what happens to the pitch?
The pitch decreases.
A pendulum oscillates 10 times in 3.0 seconds, Find the period and the frequency of the oscillation.
0.30 s, 3.3 Hz
Six pulses are generated every 0.200 s in a tank of water. What is the speed of propagation of the wave if the wavelength of the surface wave is 1.50 cm?
0.0450 m/s
Two waves interfere to form a resultant wave with zero amplitude. This was a result of…
Completely destructive interference
Alice and Bob have a 3.0 metre long jump rope. Using their hands as two fixed ends, what is the longest wavelength of a standing wave they can create?
6.0 m
This effect explains why the pitch of an ambulance siren sounds higher as it approaches you and lower as it moves away.
The Doppler Effect
When two waves are separated by half a wavelength, they are said to be... (phase relationship)
out of phase
Wave A and Wave B are found to have the same speed. Wave A has a wavelength of 40m and a frequency of 1.05Hz. If Wave B is found to have a wavelength of 30m, then what is the frequency of Wave B?
1.4 Hz
If a wave is travelling through a spring attached to a wall, will it reflect upright (in phase) or inverted (out of phase)?
Inverted (out of phase)
A string fixed at both ends is vibrating in its 2nd harmonic. If the length of the string is 1.2 m, what is the distance between adjacent nodes.
0.6 m
A train whistle has a constant frequency of 500 Hz. To a person standing beside the tracks, the pitch seems to change as the train passes. When would the observed pitch be lower and higher.
Lower: train is moving away
Higher: train is moving towards
If the frequency of a wave is doubled, what happens to the period of the wave?
The period is halved.
A water wave travels past a buoy, causing it to rise and fall 18 times in 36 seconds. If the wavelength of the wave is 2.5 m, what is the speed of the wave?
1.25 m/s
Two tuning forks are struck together and a beat frequency of 5 Hz is heard. If the first tuning fork has a frequency of 256 Hz, what is/are the possible frequencies of the second tuning fork?
251 Hz and 261 Hz
A tube closed at one end resonates at its 3rd harmonic. If the fundamental frequency of the tube is 80 Hz, what is the frequency of the 3rd harmonic?
240 Hz
Sound intensity is measured using what unit?
Decibels