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Flashcards
When is a standing wave formed??
When two waves with the same frequency and amplitude travelling in opposite directions are superimposed.
What are the points of total constructive interference in a standing wave called??
Antinodes.
What are the points of total destructive interference in a standing wave called??
Nodes.
What is the seperation between adjacent nodes or antinodes in a standing wave??
$$ \frac{\lambda}{2} $$
How much energy transfer is there in a standing wave??
None, since the waves making it are travelling in opposite directions.
How can you form a standing wave using microwaves??
Reflect microwaves from a microwave transmitter off a metal plate some multiple of the wavelength awy.
Why are waves closer to the metal plate better at creating total nodes in a microwave standing-wave experiment??
Because there is the smallest difference in distance travelled and therefore smallest difference in amplitude.
What is the phase difference for each point on the trough of a standing wave??
$$ 0 $$
They are in phase.
What is the phase difference for each point on the peak of a standing wave??
$$ 0 $$
They are in phase.
2021-07-01
What’s another word for a standing wave??
A stationary wave.
Why does is a stationary wave formed when a taut string is plucked??
Because two progressive waves travel in opposite directions and reflect off the nodes.
What is the wavelength of the progressive wave formed by plucking this string??
$$ \lambda = 2L $$
What is the fundamental mode of vibration of a string??
The simplest standing wave that can be formed by progressive waves travelling along the string.
What is the fundamental frequency of a string??
The frequency of the progressive wave that forms the simplest standing wave on a string.
What’s the frequency of the 1st harmonic in terms of the fundamental frequency $f_0$??
$$ f_0 $$
What’s the frequency of the 2st harmonic in terms of the fundamental frequency $f_0$??
$$ 2f_0 $$
What’s the frequency of the 5th harmonic in terms of the fundamental frequency $f_0$??
$$ 5f_0 $$
Why is the speed of sound greater at night time??
The speed of sound is temperature dependent.
What is true about the speed of progressive waves along a string at fixed tension??
It is constant.
2021-09-19
When might the wavelength of the fundemental mode/first harmonic in a stationary wave be $\frac{\lambda}{4}$??
When the stationary wave is formed in a closed tube.
What two situations might mean the wavelength of the fundemental mode/first harmonic in a stationary wave is $\frac{\lambda}{2}$??
When the stationary wave is formed on a fixed string or an open tube.
What do you find at the ends of an open tube when forming a stationary wave??
Antinodes.
What is the formula for the fundamental mode of a string with length $L$, tension $T$ and mass per unit length $\mu$??
$$ f = \left\frac{1}{2L}\sqrt{\frac{T}{\mu}}\right $$
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date: 2021-06-17 19:55
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title: Physics - Standing Waves
