Advanced Level Physics English Medium

08/02/2025

04/08/2024

Making new engineering materials

27/08/2023

Presentation on VEGA super car development project at NCT, University of Peradeniya, Sri Lanka. Thanks to Prof. RMG Rajapakse, Prof. HMN Bandara, and Dr. Harsha Subasinghe, the owner of "VEGA INNOVATIONS".

26/08/2023

Michael Faraday (1791–1867) was a British scientist known for his pioneering work in the fields of electromagnetism and electrochemistry. He made significant contributions that laid the foundation for modern technology.

Faraday's most famous achievements include:

1. Electromagnetic Induction:

Faraday's law of electromagnetic induction demonstrated the relationship between a changing magnetic field and the induction of an electric current. This discovery paved the way for the development of electric generators and transformers.

2. Faraday's Laws of Electrolysis:

He formulated the laws of electrolysis, which describe the quantitative relationships between the amount of substances produced during electrolytic reactions and the amount of electric current passed through them.

3. Faraday Cage:

He also discovered the concept of a Faraday cage, a conductive enclosure that shields its contents from external electric fields. This concept has applications in various fields, including electronics and electromagnetic interference protection.

4. Diamagnetism and Field Theory:

Faraday investigated diamagnetism, the property of certain materials to be weakly repelled by a magnetic field. His work contributed to the development of modern field theory.

5. Research on Chemistry:

Faraday conducted extensive research in chemistry, contributing to the understanding of chemical bonding, isolation of compounds, and the development of new materials.

6. Public Lectures:

He was an excellent science communicator and delivered a series of public lectures that helped make science more accessible to the general public.

Faraday's work not only advanced the understanding of fundamental scientific principles but also paved the way for many technological advancements, including the development of electric motors, generators, and transformers that are fundamental to our modern world.

21/04/2023

The Standard Model:

The Standard Model is a theory in particle physics that describes the behavior of three of the four fundamental forces of nature: the electromagnetic, weak, and strong forces. It is a mathematical framework that explains how particles interact with one another through these forces.

According to the Standard Model, the universe is composed of a finite number of elementary particles, which are classified into two main categories: fermions and bosons. Fermions include particles such as electrons, quarks, and neutrinos, which make up matter. Bosons include particles such as photons, W and Z bosons, and gluons, which mediate the forces between particles.

The Standard Model also predicts the existence of the Higgs boson, a particle that is responsible for giving mass to other particles. This particle was discovered at the Large Hadron Collider (LHC) in 2012.

Despite its successes, the Standard Model is not a complete theory of the universe. It does not explain the fourth fundamental force, gravity, which is described by the theory of general relativity. Additionally, the Standard Model does not account for dark matter or dark energy, which are thought to make up most of the universe's mass-energy content. As such, physicists continue to search for a more complete theory that can account for these phenomena.

Further Explanation:

The Standard Model is based on the idea that all matter is made up of particles called fermions, which come in two types: quarks and leptons. There are six types of quarks (up, down, charm, strange, top, and bottom) and six types of leptons (electrons, muons, taus, and their corresponding neutrinos). Quarks and leptons are also classified into three generations or "families", with each generation consisting of two quarks and two leptons.

The Standard Model also describes the four fundamental forces of nature: the electromagnetic force, the weak force, the strong force, and gravity. The electromagnetic force is responsible for interactions between charged particles, while the weak force is responsible for nuclear decay. The strong force binds quarks together to form protons and neutrons. Gravity is not included in the Standard Model, as it is described by the theory of general relativity.

The Standard Model also includes particles called gauge bosons, which mediate the fundamental forces. For example, photons are the gauge bosons of the electromagnetic force, while W and Z bosons are the gauge bosons of the weak force. Gluons are the gauge bosons of the strong force, and they bind quarks together to form protons and neutrons.

In addition to fermions and gauge bosons, the Standard Model includes the Higgs boson. The Higgs boson is responsible for giving mass to other particles. According to the Standard Model, particles acquire mass by interacting with a field called the Higgs field, which permeates all of space.

The Standard Model has been extremely successful in explaining the behavior of particles and predicting the results of experiments. However, it does have some limitations. For example, it does not explain the existence of dark matter or dark energy, and it does not incorporate gravity. As a result, physicists are actively searching for a more complete theory that can account for these phenomena.

Cheers !

References:

Griffiths, D. (2008). Introduction to elementary particles. John Wiley & Sons.

Halzen, F., & Martin, A. D. (1984). Quarks and leptons: An introductory course in modern particle physics. John Wiley & Sons.

Particle Data Group. (2020). Review of particle physics. Physical Review D, 102(1), 010001.

Peskin, M. E., & Schroeder, D. V. (1995). An introduction to quantum field theory. Westview Press.

Ryder, L. H. (1996). Quantum field theory. Cambridge University Press.

Weinberg, S. (1995). The quantum theory of fields: Volume 1, Foundations. Cambridge University Press.

Zee, A. (2003). Quantum field theory in a nutshell. Princeton University Press.

13/04/2023

The role of Physics is to combine Mathematics into the real world

19/02/2023

Efficiency of typical solar panels:

The efficiency of a typical solar panel varies depending on the type of solar cell technology used, the quality of the panel's manufacturing, and environmental conditions such as temperature and sunlight intensity.

The most common type of solar panel technology is crystalline silicon, which typically has a panel efficiency ranging from 15% to 20%. Some higher-end crystalline silicon panels can reach efficiencies of up to 22%. Thin-film solar panels, which use a variety of different materials, have efficiencies ranging from around 10% to 13%.

It's important to note that while panel efficiency is a factor in determining the amount of electricity a solar panel can generate, it's not the only factor. Other important factors include the size of the panel, the angle and orientation at which it is mounted, and the amount of sunlight the panel receives throughout the day.

Cheers !

15/02/2023

Coriolis Force:

The Coriolis force is a fictitious force that appears to act on objects that are in motion on a rotating frame of reference, such as the Earth. It is named after the French mathematician Gaspard-Gustave de Coriolis, who first described the phenomenon in 1835.

The Coriolis force arises because of the tendency of objects in motion to maintain their velocity and direction. On a rotating frame of reference, such as the Earth, this causes objects to appear to veer off course. Specifically, the Coriolis force acts perpendicular to the direction of motion and the axis of rotation of the frame of reference, and it depends on the speed, direction of the moving object with respect to the frame of reference, and the angular velocity of the rotating frame of reference about its axis of rotation.

One common example of the Coriolis force is the deflection of winds and ocean currents on the Earth's surface. In the Northern Hemisphere, the Coriolis force causes moving objects to veer to the right, while in the Southern Hemisphere, it causes them to veer to the left.

The Coriolis force is an important factor in many areas of science and engineering, including meteorology, oceanography, and aerospace engineering.

The concept of Coriolis force and its consequences are applicable for objects falling onto the Earth because of the Earth is a rotating system (reference). In a non-rotating frame of reference, a moving object will continue to move in a straight line at a constant velocity unless acted upon by an external force. However, on a rotating frame of reference, such as the Earth, the direction of motion of an object appears to be deflected because the frame of reference is itself rotating.

The Coriolis force is perpendicular to both the direction of motion and the axis of rotation. In the Northern Hemisphere, it acts to the right of the direction of motion, while in the Southern Hemisphere it acts to the left.

The Coriolis force is a significant factor in the movement of air masses and ocean currents, particularly over long distances. The Earth's rotation causes winds and ocean currents to move in circular patterns, known as gyres, which can have a significant impact on regional weather patterns and ocean circulation.

The Coriolis force also plays an important role in the design and operation of many engineering systems. For example, it affects the stability and control of aircraft, rockets, and missiles. And also it is taken into account in the design of long-span bridges and tall buildings.

In addition to its practical applications, the Coriolis force is also of interest to physicists and mathematicians in their theoretical studies.

Cheers !

14/01/2023

Everyday task is challenging

15/10/2022

Me with my friend Dr. Marjan