Resonance occurs when a vibrating object causes vibrations in nearby objects which have the same natural frequency - Leaving Cert Physics - Question 7 - 2007
Question 7
Resonance occurs when a vibrating object causes vibrations in nearby objects which have the same natural frequency.
Explain the underlined terms.
Describe an exper... show full transcript
Worked Solution & Example Answer:Resonance occurs when a vibrating object causes vibrations in nearby objects which have the same natural frequency - Leaving Cert Physics - Question 7 - 2007
Step 1
Explain resonance and natural frequency.
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Answer
Resonance is the rapid amplification of sound that occurs when the frequency of a vibrating object matches the natural frequency of another object. This process is essential for understanding how energy is transferred through vibrations. The natural frequency of an object is the specific frequency at which it tends to vibrate when disturbed. To illustrate, consider a swing; it will naturally oscillate back and forth at a specific pace that is determined by its physical properties.
Step 2
Describe an experiment to demonstrate resonance.
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Answer
An effective experiment to demonstrate resonance involves using tuning forks of various frequencies. Set up a tube filled with air and strike a tuning fork, then hold it above the tube. Adjust the length of the air column until you hear a noticeable increase in sound volume, indicating resonance. You can also use different tuning forks to observe which ones resonate with the air column effectively.
Step 3
What is the name given to (i) the distance A, (ii) height B?
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(i) The distance A is called the wavelength.
(ii) The height B is known as the amplitude, which represents the intensity of the wave.
Step 4
Explain what is meant by the frequency of a wave.
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Answer
The frequency of a wave refers to the number of complete cycles that occur in a given time period, typically measured in seconds. It is expressed in hertz (Hz), where 1 Hz equates to one cycle per second.
Step 5
State the wave property on which (i) the loudness, (ii) the pitch, of a note depends.
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Answer
(i) The loudness of a note depends on its amplitude; larger amplitudes produce louder sounds.
(ii) The pitch of a note depends on its frequency; higher frequencies result in higher pitches.
Step 6
Calculate the wavelength of the note produced by the tin-whistle.
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Answer
To calculate the wavelength, use the formula λ=fc where c is the speed of sound and f is the frequency of the note. Given that the frequency is 256 Hz and the speed of sound in air is 340 m s⁻¹, the calculation is as follows:
λ=256Hz340m s−1≈1.33m.
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