The Royal Institution - Beyond the map - Philip Morrison's 1968 Christmas Lectures 6/6
The lecture begins with a discussion on the importance of correcting scientific errors, using the example of Beatrice the mouse's weight. It then delves into the concept of oscillators, explaining their fundamental properties and how they are used to understand various physical phenomena. Oscillators, such as pendulums and springs, are described as systems where the period of oscillation is independent of the amplitude of the swing, making them simple oscillators. The lecture highlights the application of oscillators in different contexts, from wristwatches to large structures like bridges, and even in understanding atomic and quantum behaviors. The Tacoma Bridge collapse is used as an example of large-scale oscillation, while the use of tuning forks in watches illustrates small-scale applications. The lecture also discusses the challenges of isolating oscillators from external disturbances and the role of temperature and quantum effects in influencing oscillatory behavior. The concept of persistent currents in superconductors is introduced, demonstrating how they can maintain oscillations without energy loss over long periods. The lecture concludes by mapping oscillators across a wide range of scales, emphasizing their significance in both classical and modern physics.
Key Points:
- Oscillators are systems where the period of oscillation is independent of the amplitude, making them simple to study.
- They are used in various applications, from wristwatches to bridges, and help understand atomic and quantum behaviors.
- External disturbances and temperature can affect oscillators, but superconductors can maintain oscillations without energy loss.
- The Tacoma Bridge collapse illustrates the impact of large-scale oscillations, while tuning forks in watches show small-scale applications.
- Oscillators help map physical phenomena across scales, from classical mechanics to quantum physics.
Details:
1. 🐭 Beatrice the Mouse: Correcting Scientific Mistakes
- Beatrice the Mouse was initially reported to weigh 13 grams, but a correction revealed she actually weighs 35 grams.
- The error correction demonstrates the scientific process of identifying and rectifying mistakes.
- Beatrice eats about 1/5th of her weight each day, aligning with expected patterns for animals, rather than the incorrect initial assumption.
- Comparatively, humans eat about 1/32 of their weight daily, and a horse eats about 1/60 of its weight, illustrating how food consumption as a fraction of body weight decreases with larger animal size.
2. 🔤 Legato Machine: Fun with Letters
- The Legato machine can be entertaining by attempting to create words using a pool of letters.
- Using a balanced mix of the 26 letters will often result in unpronounceable words due to an excess of consonants like 'x', 'z', and 'j'.
- For English speakers, adjusting the frequency of letters so they reflect their occurrence in English can produce more pronounceable words, although they may not be meaningful.
- Examples of words generated include 'jazz', 'buzz', and 'quiz', showcasing the challenge of balancing letter frequency and word pronounceability.
- Segmenting the task into choosing letters based on frequency first, then generating words, can improve the process.
3. 🔬 Beyond the Map: Exploring Modern Physics
- The lecture moves beyond traditional experiences to cover aspects of modern physics, emphasizing concepts that differ significantly from classical physics.
- Two key readings are recommended to understand the importance of scale in physics: 'Possible Worlds' by JBS Haldane and 'Growth in Form' by Darcy Thompson.
- Excerpts from these books are available in 'The World of Mathematics', which can be found in libraries or as paperbacks.
- The focus is on modern physics concepts like oscillators (e.g., springs and pendulums) to illustrate new findings.
- This approach highlights the novel insights of modern physics, encouraging a deeper exploration beyond classical paradigms.
4. 🌀 Understanding Oscillators: Springs, Mass, and Motion
4.1. The Role of Gravity in Pendulums
4.2. Mass and Oscillator Rhythm
4.3. Simple Oscillators and Tuning
5. 🎶 Real World Oscillators: From Tuning Forks to Bridges
5.1. Characteristics and Energy Dynamics of Real World Oscillators
5.2. Applications and Examples of Real World Oscillators
6. 🌍 Trembling Motion: Exploring Molecular and Gravitational Effects
6.1. Man-Made Oscillators
6.2. Oscillators in Music
6.3. Understanding Oscillators
6.4. Challenges in Keeping Oscillators at Rest
6.5. Brownian Motion and Molecular Effects
6.6. Atomic Nature of Trembling Motion
7. 💡 Quantum Currents: Superconductors and Persistent Motion
7.1. Tide Observations and Oscillators
7.2. Detecting Celestial Bodies through Oscillators
7.3. Precision Instruments and Their Capabilities
7.4. Quantum Effects and Electromagnetic Phenomena
7.5. Persistent Currents and Superconductivity
7.6. Practical Demonstrations and Implications
7.7. Conclusions and Future Prospects
8. 📈 Mapping Oscillators: A Journey Through Scales
8.1. Mapping Oscillators Across Different Scales
8.2. Impact of Quantum and Gravitational Effects
9. 🎓 Closing Remarks: Future of Scientific Exploration
- There is an expectation that future scientific explorations will yield maps and discoveries as remarkable and unexpected as past voyages, such as Gulliver's Travels and the map of the oscillator.
- The speaker expresses uncertainty about the future but emphasizes the continuous potential for groundbreaking discoveries.
- The notion of exploration and discovery is likened to historical and literary references, suggesting a deep and enduring curiosity and ambition in scientific endeavors.