Wednesday 22 May 2024

Schrödinger's Cat and the Double Slit Experiment

 

Quantum 101 Episode 4: Superposition Explained | Schrödinger's Cat
Perimeter Institute for Theoretical Physics

On 22/5/24, the thought experiment of the Schrödinger's Cat was discussed in class.  

Three interesting questions relating to the Schrödinger's Cat are:
  • What was the original intention of the story?
  • Why does Schrödinger's seemingly paradoxical thought experiment become part of the foundation of quantum mechanics?
  • How would one respond philosophically to the findings of quantum theory?
    • A response to the above is here
The story is related to the double slit experiment as explained below.


Double Slit Experiment explained! by Jim Al-Khalili
The Royal Institution

Additional Information

1.   YouTube video: A Brief History of Quantum Mechanics - with Sean Carroll - The Royal Institution: https://youtu.be/5hVmeOCJjOU?si=GviGWw4WK6NOtZ_O (The Schrodinger's Cat thought experiment is explained at around 17:25 minutes in this video)

2.  Wikipedia - Schrödinger's Cat: https://simple.wikipedia.org/wiki/Schr%C3%B6dinger%27s_cat


Wednesday 15 May 2024

Some questions related to Critical Thinking


We had an interesting discussion in class today (15/5/24).  A number of questions were raised in class today which could be explored more.  All these could be a discussion topic on their own.  Thanks to all the class members who brought these topics up in class.

What is Post Hoc Ergo Propter Hoc?

This informal fallacy was mentioned in class.  The following gives some information on the fallacy.

Wikipedia: https://en.wikipedia.org/wiki/Post_hoc_ergo_propter_hoc

YouTube- Wireless Philosophy: https://www.youtube.com/watch?v=5A7hSaoRv0g

Are there Facts?

The term "Fact" was discussed in class today.  The following gives some information on the term.

Wikipedia: https://en.wikipedia.org/wiki/Fact

Stanford Encyclopedia of Philosophy: https://plato.stanford.edu/entries/facts/index.html

PPPD post - Fact and Truth: https://philosophyphorphun.blogspot.com/search?q=Facts

Do luck and serendipity relate to critical thinking? 

For scientific studies, which use inductive reasoning, scientists use appropriate techniques such as experimental design, random sampling to avoid the effect of luck and serendipity in the their experimental results and conclusions.  Nevertheless luck and serendipity can play a significant role in scientific research and discovery.

The following links give some information on luck and serendipity:

Internet Encyclopedia of Philosophy: https://iep.utm.edu/luck/#H1

The Philosophy of Everything: https://www.thephilosophyofeverything.com/blog/2016/8/28/the-philosophy-of-luck 

Wikipedia: https://en.wikipedia.org/wiki/Serendipity

[The following response to this question was added on 19/5/24]

ABC Radio Late Night Live - How chance and luck profoundly shape our lives:  

https://www.abc.net.au/listen/programs/latenightlive/annie-jacobsen-nuclear-war-mark-rank-luck-randomness/103744286

Do you believe in ghosts?

One might decide to believe in ghosts or not.  Would one accept a particular religious or cultural account of ghosts, or would one work out an individual version of the concept of ghosts?   If one decides to believe the existence of ghosts, how does that affect one's outlook and daily life? 

A Philosopher's Blog:  https://aphilosopher.wordpress.com/?s=ghost

Wikipedia: https://en.wikipedia.org/wiki/Ghost

[The following response to this question was added on 19/5/24]

[Sam's contribution 19/5/24]

As mentioned above, one might decide to believe in ghosts or not.  

One common way of deciding if something is real or not is to rely on one's perception.  If one can see and feel a table in front of oneself, one is entitled to believe there is in fact a table in front.  Another way to decide if something is real or not is to rely on a trusted source.

Therefore, if one has seen ghosts or if a trusted friend says they have seen ghosts, how should one respond to that information?  

After carefully considering the information, one may consider what happened or what was reported to have happened was hallucination or illusion.  The following gives some information on the topic of hallucination:

Cleveland Clinic article on Hallucinations:   

Wikipedia - Hallucination: https://en.wikipedia.org/wiki/Hallucination

The following gives some information on mass hallucination:

The Bart Ehrman Blog: https://ehrmanblog.org/group-hallucinations-how-can-they-possibly-happen/

American Psychological Association: Collective hysteria - Updated on 04/19/2018

The spontaneous outbreak of atypical thoughts, feelings, or actions in a group or social aggregate. Manifestations may include psychogenic illness, collective hallucinations, and bizarre actions. Instances of epidemic manias and panics, such as choreomania in the Middle Ages, tulipmania in 17th-century Holland, and radio listeners’ reactions to the Orson Welles broadcast based on H. G. Wells’s War of the Worlds in 1938, have been attributed to collective hysteria. Also called group hysteria; epidemic hysteria; mass hysteria. 

However, if one considers that the scientific explanations are not satisfactory, and decides to believe in the existence of ghosts, what then?  Should one accept a particular religious or cultural view of ghosts?  

Personally, I believe if one decides to believe in ghosts, it is better to come up with one's personal concept of ghosts.  This is because (1) there are many different religious or cultural views of ghosts.  It would be difficult to work out which is the correct view; and (2) religions and cultures often have particular reasons why they form their views of ghosts which may not be suitable or appropriate for oneself.

My initial thought is that ghosts, if real, could be like the person's mental spirit.  The physical body would pass away, but the person's mental spirit lingers.  That mental spirit would also eventually pass away just like the physical body.  My rationale is that often reports of ghosts are seen in this world.  Therefore, based on the principle of Occam's razor, there is no reason to postulate there is another realm where ghosts live.  In addition, often people do not report that you see ghosts of people who have passed away many years ago.  Therefore, it is reasonable to postulate that ghosts do not exist forever.  

Can we rely on perception to determine truth?

[This question and response were added on 21/5/24]

Perception can be a tricky foundation for determining truth, as it is inherently subjective and influenced by numerous factors such as personal experiences, beliefs, and biases. While perception can provide us with valuable information about the world around us, it is not always a reliable indicator of objective truth.

For example, optical illusions demonstrate how our sensory perception can be deceived, leading us to interpret visual information in ways that do not align with reality. Similarly, two people can witness the same event but have different perceptions of what occurred based on their individual perspectives.

In philosophy, this topic is often explored under the branch of epistemology, which studies the nature of knowledge, belief, and truth. Philosophers have long debated whether our senses can be trusted to convey truth, with some arguing that only through reason and logic can we approach an understanding of objective reality.

Ultimately, while perception is a valuable tool for navigating our environment, it is important to corroborate perceptual experiences with evidence and rational analysis to form a more accurate picture of truth.

[The above response is from Bing Copilot 21/5/24]

The following videos may be relevant to this question:

Your brain hallucinates your conscious reality | Anil Seth | TED: https://youtu.be/lyu7v7nWzfo?si=aKAwkHwjIREkiomt

Consciousness: Neuroscience, Perception and Hallucination – Professor Anil Seth:  https://youtu.be/cCyapf0E5ns?si=jqNtB8mUIFP-5vR6

The above videos may be relevant to the question regarding Ghosts.

What is the history of Critical Thinking?

[This question and response were added on 21/5/24]

The following article gives a description of the history of Critical Thinking:

A Brief History of the Idea of Critical Thinking

Monday 13 May 2024

The Song of the Travelling Son

Photo by KE ATLAS on Unsplash

The following poem is a well known Chinese poem called The Song of the Travelling Son 遊子吟 from a Tang dynasty poet Meng Jiao 孟郊 (751-814).  

慈母手中線,遊子身上衣。 

Sewing-thread in hand, the loving mother;
Clothes for the son to wear, her travelling son. 

臨行密密縫,意恐遲遲歸。 

On and on she sews, his leaving now nears;
Stitch on stitch, she fears -- a delayed reunion. 

誰言寸草心,報得三春暉。 

Who says the heart of a mere grass seedling, can ever
Repay the embracing rays of the warm spring sun!

This poem is about an ordinary mother of meagre means.  The mother has to make the clothes for the travelling son herself.  The third and fourth lines describe how she busily does her sewing as her son is about to leave.  She worries if her son will be late coming home.  

This mother is not doing anything extraordinary.  That is exactly how the poet describes the mothers' love everywhere and through all times.   There are some mothers who might be doing amazing things, and there are some who are not loving.  The poet indirectly acknowledges that there are exceptions.  

The poet is describing an ordinary mother who is concerned her son may not be warm enough when travelling.  She worries when he will be coming back, yet there is no indication that she would complain about her son's leaving.

The last two lines compare the heart of a young person to that of a mere simple grass seedling, and the mother's love to the embracing rays of the warm spring sun.  The poets compares the relationship between mother and son to that of the sun and a blade of grass.  The mother's love for her son is like the sunray on the grass.  

What is free will?

  Photo by Khashayar Kouchpeydeh on Unsplash Philosophy Now Article Please find the following article: - What is Free Will? Some Questions f...