Current Affairs 5th March 2025
Current Affairs 5th March 2025 by Saurabh Pandey Sir
Dolphin Conservation Report Dolphin Population
Overview
🐬 Dolphin Population: The report highlights 6,324 Ganges river dolphins and three Indus river dolphins.
🌊 Distribution: Ganga main stem: 3,275 dolphins Ganga tributaries: 2,414 dolphins Brahmaputra main stem: 584 dolphins Brahmaputra tributaries: 412 dolphins Beas river: 101 dolphins Conservation Challenges and Advocacy
🐟 Threats to Dolphins: Major threats include entanglement in fishermen’s nets and pollution affecting their habitat.
👦 Conservation Advocacy: Prime Minister Narendra Modi emphasized the role of local populations in conservation efforts and encouraged schoolchildren to visit dolphin habitats. Geographical Insights
📍 Geographical Insights: The highest dolphin populations were found in Uttar Pradesh, followed by Bihar, West Bengal, and Assam Superconductivity: The Fascinating Behavior of Zinc Introduction to Superconductivity Superconductivity is a phenomenon that captures the imagination of scientists and enthusiasts alike. At the heart of this marvel lies the ability of certain materials, like zinc, to conduct electricity without any resistance at ultra-low temperatures.
Zinc’s Electrical Conductivity: TemperatureDependency Zinc’s electrical conductivity is acaptivating subject, particularly when examininghow it varies with temperature. At a pleasant20°C, zinc boasts an impressive conductivity ofapproximately 16.9 million siemens per meter.However, as it cools to an astonishing -272.3°C,zinc transforms into a superconductor, enablingit to conduct electricity with zero resistance.Room
Temperature vs. Low Temperature: Atroom temperature, electrons in a grid of zincatoms move freely, facilitating electricity flow.Cooling zinc weakens various forces, leading toan intriguing transition where electrons pair up,thus paving the way for superconductivity.The Role of Cooper Pairs in SuperconductivityThe formation of Cooper pairs is a cornerstone inunderstanding superconductivity. As thetemperature drops, the net attractive forcebetween electrons becomes significant. Thesepairs exhibit collective behavior, allowing themto navigate through the crystal lattice withoutscattering.Key Characteristics of Cooper Pairs:
Electronsform pairs without necessarily getting closer.This coupling results in a collective state thatenhances conductivity.Understanding Bose Metals and AnomalousMetallic States Bose metals represent a uniquestate of matter, showcasing the fascinatinginterplay of Cooper pairs. Unlike traditionalsuperconductors, Bose metals fail to establishlong-range superconducting coherence, leadingto anomalous metallic behavior. Understandingthese states is crucial for unraveling themysteries of disordered metals. Key Insights onBose Metals: They are characterized by thepresence of Cooper pairs without fullsuperconductive properties. Studying thesematerials provides insights into the behavior ofirregular structures and impurities in metals.The Impact of Impurities and External Conditionson Superconductivity
The presence of impuritiescan significantly disrupt the superconductingstate of metals. Zinc, for instance, can beadversely affected by external magnetic fields,which tend to interfere with its superconductiveproperties. The fascinating aspect here is theway materials respond to these externalconditions. Influence of Impurities: Impuritiescan introduce disorder, affecting electronpairing. Understanding these influences isessential for developing new superconductingmaterials. Conclusion In summary, the world ofsuperconductivity is rich with complexities andsurprises, particularly when examining zinc’sbehavior at low temperatures. From theformation of Cooper pairs to the peculiarities ofBose metals, this field of study continues tocaptivate researchers and hold promise forfuture technological advancements.
