Explain the term resonance - Leaving Cert Physics - Question 7 - 2015
Question 7
Explain the term resonance.
Describe a laboratory experiment to demonstrate resonance.
The diagram shows a waveform.
(i) What is length A called?
(ii) What is len... show full transcript
Worked Solution & Example Answer:Explain the term resonance - Leaving Cert Physics - Question 7 - 2015
Step 1
Explain the term resonance.
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Answer
Resonance is defined as the transfer of energy between two systems that are oscillating at similar frequencies. When an external force is applied to a system at its natural frequency, it can lead to a significant increase in amplitude, resulting in resonance. This phenomenon is commonly observed in musical instruments such as tuning forks.
Step 2
Describe a laboratory experiment to demonstrate resonance.
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Answer
Apparatus: Use Barton’s pendulums, tuning forks, adjustable length of air column.
Procedure: Hang two pendulums vertically from a horizontal string. Strike a tuning fork and hold it above a pendulum. Adjust the length of the air column by moving it closer or further.
Observation: When the length is tuned to the right frequency, the pendulum starts swinging with a larger amplitude as the external tuning fork resonates with it. This indicates energy transfer and resonance occurring.
Step 3
What is length A called?
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Length A is called the wavelength (λ) of the waveform.
Step 4
What is length B called?
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Length B is called the amplitude (height) of the wave.
Step 5
What is meant by the frequency of a wave?
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The frequency of a wave refers to the number of complete cycles (oscillations) of the wave that occur per second, measured in Hertz (Hz).
Step 6
List three characteristics of a musical note.
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Loudness: The perceived intensity of the sound.
Pitch: The frequency of the sound wave determining how high or low it is.
Quality (Timbre): The unique tone color or quality of the sound that distinguishes different types of sound production.
Step 7
What is meant by the term natural frequency of an object?
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The natural frequency of an object is the frequency at which it vibrates freely when not subjected to any continuous external force. It is determined by the physical properties of the object, such as mass and stiffness.
Step 8
Calculate the wavelength of the sound wave produced.
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To find the wavelength (λ), use the formula:
ext{Wavelength} ( ext{λ}) = rac{ ext{speed of sound in air}}{ ext{frequency}} = rac{340 ext{ m s}^{-1}}{250 ext{ Hz}}
Thus, the wavelength is:
extλ=1.36extm
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