CBSE Class 11 Physics Chapter 1: Physical World NCERT Solutions

Albert Einstein's statement suggests a profound paradox about our universe. On one hand, the sheer scale, complexity, and diversity of natural phenomena make the world seem incredibly difficult, or even impossible, to fully grasp – hence, "incomprehensible." However, the fact that humans are capable of observing, experimenting, discovering patterns, formulating laws, and building theories to explain these phenomena implies that the universe is fundamentally ordered and logical. This underlying order makes it "comprehensible" to the human intellect. Essentially, Einstein was marveling at our ability to understand the universe, highlighting that the existence of discoverable physical laws is itself a remarkable and somewhat mysterious aspect of reality.

This statement accurately describes the life cycle of many groundbreaking scientific theories. Initially, a new theory often challenges established beliefs and accepted scientific paradigms, making it seem radical or even heretical to the contemporary scientific community. Over time, as evidence accumulates and the theory proves its explanatory power and predictive accuracy, it gains acceptance and eventually becomes the standard, accepted view – a dogma.

Examples:

• Heliocentric Model: Nicolaus Copernicus proposed that the Earth revolves around the Sun, contradicting the long-held geocentric model (Ptolemaic system) where the Earth was considered the center of the universe. This was initially met with strong resistance but eventually became the accepted model due to the work of Kepler, Galileo, and Newton.
• Theory of Evolution: Charles Darwin's theory of evolution by natural selection was considered highly controversial and heretical when first proposed, challenging religious and scientific views of creation. Today, it is the cornerstone of modern biology.
• Quantum Mechanics: Early quantum ideas, such as energy quantization proposed by Max Planck and the wave-particle duality, were revolutionary and difficult to accept, as they departed significantly from classical physics. Now, quantum mechanics is a fundamental and well-established theory.

This aphorism draws a parallel between politics and science, highlighting a key aspect of how each discipline operates.

"Politics is the art of the possible" implies that politicians work within the constraints of what is achievable in a given social, economic, and political context. They must make pragmatic decisions based on feasibility and compromise, rather than pursuing unattainable ideals.

"Science is the art of the soluble" suggests that science progresses by focusing on problems that can, in principle, be solved through investigation, observation, and experimentation. Scientists identify questions that are amenable to empirical study and seek to find answers within the framework of natural laws. It doesn't mean science solves everything, but rather that it directs its efforts towards phenomena that yield to scientific methods. The focus is on tackling questions that are 'soluble' – that can be investigated and potentially explained, rather than those that are inherently metaphysical or beyond empirical verification.

Several factors have historically hindered the full advancement of science in India, despite its growing capabilities:

• Inadequate Funding: Insufficient investment in research and development, leading to a lack of state-of-the-art equipment, limited research projects, and lower salaries for scientists compared to global standards.
• Outdated Infrastructure: Many educational institutions and research laboratories suffer from old and outdated equipment and facilities, which are not conducive to cutting-edge research.
• Societal and Traditional Mindsets: A significant portion of the population may still hold traditional beliefs or lack a deep understanding and appreciation for the importance of scientific temper and inquiry.
• Limited Employment Opportunities: A lack of sufficient and rewarding career paths for science graduates and researchers within the country can lead to a "brain drain" as talented individuals seek opportunities abroad.
• Deficiencies in Science Education: Gaps in the quality and accessibility of science education at school and college levels, often focusing on rote learning rather than critical thinking and innovation.
• Bureaucratic Hurdles: Complex administrative procedures and bureaucratic red tape can sometimes slow down research initiatives and the implementation of new ideas.

The argument presented by the superstitious man is flawed because it fails to distinguish between scientific evidence and mere belief or superstition. While it's true that electrons, being subatomic particles, cannot be directly "seen" with the naked eye or even conventional microscopes due to their size and nature, their existence is supported by a vast body of indirect, empirical evidence and consistent theoretical predictions.

Scientific Refutation:

• Observable Effects: The existence and behavior of electrons are inferred from numerous observable phenomena and experiments. For instance, electrons are responsible for electric current, chemical bonding, the operation of electronic devices (like TVs and computers), and phenomena like the photoelectric effect and the Zeeman effect. These effects are measurable, predictable, and consistently explained by the theory of electrons.
• Theoretical Framework: The concept of the electron is an integral part of well-established theories like quantum mechanics and electromagnetism, which have been rigorously tested and validated over decades.
• Predictive Power: The theory of electrons allows physicists to make accurate predictions about physical and chemical processes, which are then confirmed by experiments.

Contrast with Ghosts: In contrast, the existence of ghosts is not supported by any consistent, verifiable, empirical evidence. There are no measurable effects or phenomena that can be reliably attributed to ghosts, nor do they fit into any established scientific framework. Claims about ghosts are typically anecdotal, subjective, and lack the predictive power and explanatory consistency that characterize scientific theories. Therefore, believing in electrons based on scientific evidence is fundamentally different from believing in ghosts based on superstition or lack of evidence to the contrary.

Explanation (b) strikes as the scientific explanation. Let's analyze why:

Explanation (a): This explanation invokes supernatural or mystical intervention ("nature through its inscrutable ways"). It suggests a direct, intentional act by nature to imprint a face as a tribute. This is not a scientific explanation because it relies on untestable, non-empirical claims and lacks a mechanism that can be studied or verified through observation and experimentation.

Explanation (b): This explanation proposes a process rooted in natural selection, specifically artificial selection in this context. It suggests that fishermen's actions (releasing crabs with certain shell shapes) created a selective pressure. Crabs with shells resembling the Samurai's face were more likely to survive and reproduce because they were released, leading to the propagation of that trait over generations. This explanation is scientific because:

• It proposes a plausible mechanism (selective breeding/survival).
• It is based on observable human behavior (fishermen's actions) and biological principles (inheritance and selection).
• It is potentially testable or verifiable through further study of crab populations and their genetics in that region.

This is a classic example of how human actions can influence the evolution of a species, leading to the prevalence of certain traits that might appear coincidental or remarkable.