CSD 311 – Resonance

These flashcards cover key concepts related to resonance as discussed in the CSD 311 lecture.

What is resonance?

A vibration of large amplitude in a mechanical or electrical system caused by a relatively small periodic stimulus of the same or nearly the same period as the natural vibration period of the system.

What is a natural frequency?

The frequency at which a matter vibrates when energized by an outside force.

What happens when an outside force is removed from a vibrating system at its natural frequency?

It will continue to vibrate if damping forces are small.

What is a resonator?

An object that reinforces sound but does not truly amplify it.

What is the effect of the tuning fork on a desk surface?

The tuning fork sets the molecules in the desk surface into vibration, making the sound heard as being louder.

What happens when two tuning forks of similar frequencies are brought close together?

The non-vibrating tuning fork will be set into forced vibration by the vibrating tuning fork.

What are the main factors determining the frequencies that will resonate in a tube?

The length of the tube and whether the tube is open or closed at its ends.

What is the formula for predicting resonant frequencies in a tube with one end open and one end closed?

Fn = ((2n-1) * c) / (4L), where F is the resonant frequency, n is a positive integer, c is the velocity of sound, and L is the tube length.

How does changing the water level in a tube affect resonance?

Altering the water level changes the length of the air column, allowing it to match the tuning fork's frequency.

What happens to the amplitude of vibration when the frequency of the applied force is close to the natural frequency of an elastic system?

The amplitude of vibration will increase.

Why don’t resonators amplify sounds?

They do not truly amplify but can reinforce the sound due to resonance.

What is the relationship between frequency and wavelength?

Frequency and wavelength are inversely proportional.

How does resonance in the ear canal work?

Resonant frequencies excite and increase the amplitude of certain frequencies that match them in the ear canal.

What is resonance?

A vibration of large amplitude in a mechanical or electrical system caused by a relatively small periodic stimulus of the same or nearly the same period as the natural vibration period of the system.

What is a natural frequency?

The frequency at which a matter vibrates when energized by an outside force.

What happens when an outside force is removed from a vibrating system at its natural frequency?

It will continue to vibrate if damping forces are small.

What is a resonator?

An object that reinforces sound but does not truly amplify it.

What is the effect of the tuning fork on a desk surface?

The tuning fork sets the molecules in the desk surface into vibration, making the sound heard as being louder.

What happens when two tuning forks of similar frequencies are brought close together?

The non-vibrating tuning fork will be set into forced vibration by the vibrating tuning fork.

What are the main factors determining the frequencies that will resonate in a tube?

The length of the tube and whether the tube is open or closed at its ends.

What is the formula for predicting resonant frequencies in a tube with one end open and one end closed?

Fn = \frac{(2n-1) \cdot c}{4L}, where F is the resonant frequency, n is a positive integer, c is the velocity of sound, and L is the tube length.

How does changing the water level in a tube affect resonance?

Altering the water level changes the length of the air column, allowing it to match the tuning fork's frequency.

What happens to the amplitude of vibration when the frequency of the applied force is close to the natural frequency of an elastic system?

The amplitude of vibration will increase.

Why don resonators amplify sounds?

They do not truly amplify but can reinforce the sound due to resonance.

What is the relationship between frequency and wavelength?

Frequency and wavelength are inversely proportional.

How does resonance in the ear canal work?

Resonant frequencies excite and increase the amplitude of certain frequencies that match them in the ear canal.

What is the formula for predicting resonant frequencies in a tube open at both ends?

Fn = \frac{n \cdot c}{2L}, where F is the resonant frequency, n is a positive integer, c is the velocity of sound, and L is the tube length.

What is damping?

Any effect, either deliberate or unintentional, that reduces the amplitude